diff options
Diffstat (limited to 'gl/m4/printf.m4')
| -rw-r--r-- | gl/m4/printf.m4 | 2158 |
1 files changed, 2158 insertions, 0 deletions
diff --git a/gl/m4/printf.m4 b/gl/m4/printf.m4 new file mode 100644 index 0000000..8b8f010 --- /dev/null +++ b/gl/m4/printf.m4 @@ -0,0 +1,2158 @@ +# printf.m4 serial 84 +dnl Copyright (C) 2003, 2007-2023 Free Software Foundation, Inc. +dnl This file is free software; the Free Software Foundation +dnl gives unlimited permission to copy and/or distribute it, +dnl with or without modifications, as long as this notice is preserved. + +dnl Test whether the *printf family of functions supports the 'j', 'z', 't', +dnl 'L' size specifiers. (ISO C99, POSIX:2001) +dnl Result is gl_cv_func_printf_sizes_c99. + +AC_DEFUN([gl_PRINTF_SIZES_C99], +[ + AC_REQUIRE([AC_PROG_CC]) + AC_REQUIRE([gl_AC_HEADER_STDINT_H]) + AC_REQUIRE([gl_AC_HEADER_INTTYPES_H]) + AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles + AC_CACHE_CHECK([whether printf supports size specifiers as in C99], + [gl_cv_func_printf_sizes_c99], + [ + AC_RUN_IFELSE( + [AC_LANG_SOURCE([[ +#include <stddef.h> +#include <stdio.h> +#include <string.h> +#include <sys/types.h> +#if HAVE_STDINT_H_WITH_UINTMAX +# include <stdint.h> +#endif +#if HAVE_INTTYPES_H_WITH_UINTMAX +# include <inttypes.h> +#endif +static char buf[100]; +int main () +{ + int result = 0; +#if HAVE_STDINT_H_WITH_UINTMAX || HAVE_INTTYPES_H_WITH_UINTMAX + buf[0] = '\0'; + if (sprintf (buf, "%ju %d", (uintmax_t) 12345671, 33, 44, 55) < 0 + || strcmp (buf, "12345671 33") != 0) + result |= 1; +#else + result |= 1; +#endif + buf[0] = '\0'; + if (sprintf (buf, "%zu %d", (size_t) 12345672, 33, 44, 55) < 0 + || strcmp (buf, "12345672 33") != 0) + result |= 2; + buf[0] = '\0'; + if (sprintf (buf, "%tu %d", (ptrdiff_t) 12345673, 33, 44, 55) < 0 + || strcmp (buf, "12345673 33") != 0) + result |= 4; + buf[0] = '\0'; + if (sprintf (buf, "%Lg %d", (long double) 1.5, 33, 44, 55) < 0 + || strcmp (buf, "1.5 33") != 0) + result |= 8; + return result; +}]])], + [gl_cv_func_printf_sizes_c99=yes], + [gl_cv_func_printf_sizes_c99=no], + [ + case "$host_os" in +changequote(,)dnl + # Guess yes on glibc systems. + *-gnu* | gnu*) gl_cv_func_printf_sizes_c99="guessing yes";; + # Guess yes on musl systems. + *-musl* | midipix*) gl_cv_func_printf_sizes_c99="guessing yes";; + # Guess yes on FreeBSD >= 5. + freebsd[1-4].*) gl_cv_func_printf_sizes_c99="guessing no";; + freebsd* | kfreebsd*) gl_cv_func_printf_sizes_c99="guessing yes";; + midnightbsd*) gl_cv_func_printf_sizes_c99="guessing yes";; + # Guess yes on Mac OS X >= 10.3. + darwin[1-6].*) gl_cv_func_printf_sizes_c99="guessing no";; + darwin*) gl_cv_func_printf_sizes_c99="guessing yes";; + # Guess yes on OpenBSD >= 3.9. + openbsd[1-2].* | openbsd3.[0-8] | openbsd3.[0-8].*) + gl_cv_func_printf_sizes_c99="guessing no";; + openbsd*) gl_cv_func_printf_sizes_c99="guessing yes";; + # Guess yes on Solaris >= 2.10. + solaris2.[1-9][0-9]*) gl_cv_func_printf_sizes_c99="guessing yes";; + solaris*) gl_cv_func_printf_sizes_c99="guessing no";; + # Guess yes on NetBSD >= 3. + netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*) + gl_cv_func_printf_sizes_c99="guessing no";; + netbsd*) gl_cv_func_printf_sizes_c99="guessing yes";; + # Guess yes on Android. + linux*-android*) gl_cv_func_printf_sizes_c99="guessing yes";; +changequote([,])dnl + # Guess yes on MSVC, no on mingw. + mingw*) AC_EGREP_CPP([Known], [ +#ifdef _MSC_VER + Known +#endif + ], + [gl_cv_func_printf_sizes_c99="guessing yes"], + [gl_cv_func_printf_sizes_c99="guessing no"]) + ;; + # If we don't know, obey --enable-cross-guesses. + *) gl_cv_func_printf_sizes_c99="$gl_cross_guess_normal";; + esac + ]) + ]) +]) + +dnl Test whether the *printf family of functions supports the 'w8', 'w16', +dnl 'w32', 'w64', 'wf8', 'wf16', 'wf32', 'wf64' size specifiers. (ISO C23) +dnl Result is gl_cv_func_printf_sizes_c23. + +AC_DEFUN([gl_PRINTF_SIZES_C23], +[ + AC_REQUIRE([AC_PROG_CC]) + AC_REQUIRE([gl_AC_HEADER_STDINT_H]) + AC_REQUIRE([gl_AC_HEADER_INTTYPES_H]) + AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles + AC_CACHE_CHECK([whether printf supports size specifiers as in C23], + [gl_cv_func_printf_sizes_c23], + [ + AC_RUN_IFELSE( + [AC_LANG_SOURCE([[ +#include <stddef.h> +#include <stdio.h> +#include <string.h> +#include <sys/types.h> +#if HAVE_STDINT_H_WITH_UINTMAX +# include <stdint.h> +#endif +#if HAVE_INTTYPES_H_WITH_UINTMAX +# include <inttypes.h> +#endif +static char buf[100]; +int main () +{ + int result = 0; + buf[0] = '\0'; + if (sprintf (buf, "%w8u %d", (uint8_t) 123, 33, 44, 55) < 0 + || strcmp (buf, "123 33") != 0) + result |= 1; + buf[0] = '\0'; + if (sprintf (buf, "%wf8u %d", (uint_fast8_t) 123, 33, 44, 55) < 0 + || strcmp (buf, "123 33") != 0) + result |= 1; + buf[0] = '\0'; + if (sprintf (buf, "%w16u %d", (uint16_t) 12345, 33, 44, 55) < 0 + || strcmp (buf, "12345 33") != 0) + result |= 2; + buf[0] = '\0'; + if (sprintf (buf, "%wf16u %d", (uint_fast16_t) 12345, 33, 44, 55) < 0 + || strcmp (buf, "12345 33") != 0) + result |= 2; + buf[0] = '\0'; + if (sprintf (buf, "%w32u %d", (uint32_t) 12345671, 33, 44, 55) < 0 + || strcmp (buf, "12345671 33") != 0) + result |= 4; + buf[0] = '\0'; + if (sprintf (buf, "%wf32u %d", (uint_fast32_t) 12345671, 33, 44, 55) < 0 + || strcmp (buf, "12345671 33") != 0) + result |= 4; +#if HAVE_STDINT_H_WITH_UINTMAX || HAVE_INTTYPES_H_WITH_UINTMAX + buf[0] = '\0'; + if (sprintf (buf, "%w64u %d", (uint64_t) 12345671, 33, 44, 55) < 0 + || strcmp (buf, "12345671 33") != 0) + result |= 8; + buf[0] = '\0'; + if (sprintf (buf, "%wf64u %d", (uint_fast64_t) 12345671, 33, 44, 55) < 0 + || strcmp (buf, "12345671 33") != 0) + result |= 8; +#else + result |= 8; +#endif + return result; +}]])], + [gl_cv_func_printf_sizes_c23=yes], + [gl_cv_func_printf_sizes_c23=no], + [ + case "$host_os" in + # Guess no on glibc systems. + *-gnu* | gnu*) gl_cv_func_printf_sizes_c23="guessing no";; + # Guess no on musl systems. + *-musl* | midipix*) gl_cv_func_printf_sizes_c23="guessing no";; + # Guess no on Android. + linux*-android*) gl_cv_func_printf_sizes_c23="guessing no";; + # Guess no on native Windows. + mingw*) gl_cv_func_printf_sizes_c23="guessing no";; + # If we don't know, obey --enable-cross-guesses. + *) gl_cv_func_printf_sizes_c23="$gl_cross_guess_normal";; + esac + ]) + ]) +]) + +dnl Test whether the *printf family of functions supports 'long double' +dnl arguments together with the 'L' size specifier. (ISO C99, POSIX:2001) +dnl Result is gl_cv_func_printf_long_double. + +AC_DEFUN([gl_PRINTF_LONG_DOUBLE], +[ + AC_REQUIRE([AC_PROG_CC]) + AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles + AC_CACHE_CHECK([whether printf supports 'long double' arguments], + [gl_cv_func_printf_long_double], + [ + AC_RUN_IFELSE( + [AC_LANG_SOURCE([[ +#include <stdio.h> +#include <string.h> +static char buf[10000]; +int main () +{ + int result = 0; + buf[0] = '\0'; + if (sprintf (buf, "%Lf %d", 1.75L, 33, 44, 55) < 0 + || strcmp (buf, "1.750000 33") != 0) + result |= 1; + buf[0] = '\0'; + if (sprintf (buf, "%Le %d", 1.75L, 33, 44, 55) < 0 + || strcmp (buf, "1.750000e+00 33") != 0) + result |= 2; + buf[0] = '\0'; + if (sprintf (buf, "%Lg %d", 1.75L, 33, 44, 55) < 0 + || strcmp (buf, "1.75 33") != 0) + result |= 4; + return result; +}]])], + [gl_cv_func_printf_long_double=yes], + [gl_cv_func_printf_long_double=no], + [case "$host_os" in + # Guess no on BeOS. + beos*) gl_cv_func_printf_long_double="guessing no";; + # Guess yes on Android. + linux*-android*) gl_cv_func_printf_long_double="guessing yes";; + # Guess yes on MSVC, no on mingw. + mingw*) AC_EGREP_CPP([Known], [ +#ifdef _MSC_VER + Known +#endif + ], + [gl_cv_func_printf_long_double="guessing yes"], + [gl_cv_func_printf_long_double="guessing no"]) + ;; + *) gl_cv_func_printf_long_double="guessing yes";; + esac + ]) + ]) +]) + +dnl Test whether the *printf family of functions supports infinite and NaN +dnl 'double' arguments and negative zero arguments in the %f, %e, %g +dnl directives. (ISO C99, POSIX:2001) +dnl Result is gl_cv_func_printf_infinite. + +AC_DEFUN([gl_PRINTF_INFINITE], +[ + AC_REQUIRE([AC_PROG_CC]) + AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles + AC_CACHE_CHECK([whether printf supports infinite 'double' arguments], + [gl_cv_func_printf_infinite], + [ + AC_RUN_IFELSE( + [AC_LANG_SOURCE([[ +#include <stdio.h> +#include <string.h> +static int +strisnan (const char *string, size_t start_index, size_t end_index) +{ + if (start_index < end_index) + { + if (string[start_index] == '-') + start_index++; + if (start_index + 3 <= end_index + && memcmp (string + start_index, "nan", 3) == 0) + { + start_index += 3; + if (start_index == end_index + || (string[start_index] == '(' && string[end_index - 1] == ')')) + return 1; + } + } + return 0; +} +static int +have_minus_zero () +{ + static double plus_zero = 0.0; + double minus_zero = - plus_zero; + return memcmp (&plus_zero, &minus_zero, sizeof (double)) != 0; +} +static char buf[10000]; +static double zero = 0.0; +int main () +{ + int result = 0; + if (sprintf (buf, "%f", 1.0 / zero) < 0 + || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0)) + result |= 1; + if (sprintf (buf, "%f", -1.0 / zero) < 0 + || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0)) + result |= 1; + if (sprintf (buf, "%f", zero / zero) < 0 + || !strisnan (buf, 0, strlen (buf))) + result |= 2; + if (sprintf (buf, "%e", 1.0 / zero) < 0 + || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0)) + result |= 4; + if (sprintf (buf, "%e", -1.0 / zero) < 0 + || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0)) + result |= 4; + if (sprintf (buf, "%e", zero / zero) < 0 + || !strisnan (buf, 0, strlen (buf))) + result |= 8; + if (sprintf (buf, "%g", 1.0 / zero) < 0 + || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0)) + result |= 16; + if (sprintf (buf, "%g", -1.0 / zero) < 0 + || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0)) + result |= 16; + if (sprintf (buf, "%g", zero / zero) < 0 + || !strisnan (buf, 0, strlen (buf))) + result |= 32; + /* This test fails on HP-UX 10.20. */ + if (have_minus_zero ()) + if (sprintf (buf, "%g", - zero) < 0 + || strcmp (buf, "-0") != 0) + result |= 64; + return result; +}]])], + [gl_cv_func_printf_infinite=yes], + [gl_cv_func_printf_infinite=no], + [ + case "$host_os" in +changequote(,)dnl + # Guess yes on glibc systems. + *-gnu* | gnu*) gl_cv_func_printf_infinite="guessing yes";; + # Guess yes on musl systems. + *-musl* | midipix*) gl_cv_func_printf_infinite="guessing yes";; + # Guess yes on FreeBSD >= 6. + freebsd[1-5].*) gl_cv_func_printf_infinite="guessing no";; + freebsd* | kfreebsd*) gl_cv_func_printf_infinite="guessing yes";; + midnightbsd*) gl_cv_func_printf_infinite="guessing yes";; + # Guess yes on Mac OS X >= 10.3. + darwin[1-6].*) gl_cv_func_printf_infinite="guessing no";; + darwin*) gl_cv_func_printf_infinite="guessing yes";; + # Guess yes on HP-UX >= 11. + hpux[7-9]* | hpux10*) gl_cv_func_printf_infinite="guessing no";; + hpux*) gl_cv_func_printf_infinite="guessing yes";; + # Guess yes on NetBSD >= 3. + netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*) + gl_cv_func_printf_infinite="guessing no";; + netbsd*) gl_cv_func_printf_infinite="guessing yes";; + # Guess yes on OpenBSD >= 6.0. + openbsd[1-5].*) gl_cv_func_printf_infinite="guessing no";; + openbsd*) gl_cv_func_printf_infinite="guessing yes";; + # Guess yes on BeOS. + beos*) gl_cv_func_printf_infinite="guessing yes";; + # Guess no on Android. + linux*-android*) gl_cv_func_printf_infinite="guessing no";; +changequote([,])dnl + # Guess yes on MSVC, no on mingw. + mingw*) AC_EGREP_CPP([Known], [ +#ifdef _MSC_VER + Known +#endif + ], + [gl_cv_func_printf_infinite="guessing yes"], + [gl_cv_func_printf_infinite="guessing no"]) + ;; + # If we don't know, obey --enable-cross-guesses. + *) gl_cv_func_printf_infinite="$gl_cross_guess_normal";; + esac + ]) + ]) +]) + +dnl Test whether the *printf family of functions supports infinite and NaN +dnl 'long double' arguments in the %f, %e, %g directives. (ISO C99, POSIX:2001) +dnl Result is gl_cv_func_printf_infinite_long_double. + +AC_DEFUN([gl_PRINTF_INFINITE_LONG_DOUBLE], +[ + AC_REQUIRE([gl_PRINTF_LONG_DOUBLE]) + AC_REQUIRE([AC_PROG_CC]) + AC_REQUIRE([gl_BIGENDIAN]) + AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE]) + AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles + dnl The user can set or unset the variable gl_printf_safe to indicate + dnl that he wishes a safe handling of non-IEEE-754 'long double' values. + if test -n "$gl_printf_safe"; then + AC_DEFINE([CHECK_PRINTF_SAFE], [1], + [Define if you wish *printf() functions that have a safe handling of + non-IEEE-754 'long double' values.]) + fi + case "$gl_cv_func_printf_long_double" in + *yes) + AC_CACHE_CHECK([whether printf supports infinite 'long double' arguments], + [gl_cv_func_printf_infinite_long_double], + [ + AC_RUN_IFELSE( + [AC_LANG_SOURCE([[ +]GL_NOCRASH[ +#include <float.h> +#include <stdio.h> +#include <string.h> +static int +strisnan (const char *string, size_t start_index, size_t end_index) +{ + if (start_index < end_index) + { + if (string[start_index] == '-') + start_index++; + if (start_index + 3 <= end_index + && memcmp (string + start_index, "nan", 3) == 0) + { + start_index += 3; + if (start_index == end_index + || (string[start_index] == '(' && string[end_index - 1] == ')')) + return 1; + } + } + return 0; +} +static char buf[10000]; +static long double zeroL = 0.0L; +int main () +{ + int result = 0; + nocrash_init(); + if (sprintf (buf, "%Lf", 1.0L / zeroL) < 0 + || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0)) + result |= 1; + if (sprintf (buf, "%Lf", -1.0L / zeroL) < 0 + || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0)) + result |= 1; + if (sprintf (buf, "%Lf", zeroL / zeroL) < 0 + || !strisnan (buf, 0, strlen (buf))) + result |= 1; + if (sprintf (buf, "%Le", 1.0L / zeroL) < 0 + || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0)) + result |= 1; + if (sprintf (buf, "%Le", -1.0L / zeroL) < 0 + || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0)) + result |= 1; + if (sprintf (buf, "%Le", zeroL / zeroL) < 0 + || !strisnan (buf, 0, strlen (buf))) + result |= 1; + if (sprintf (buf, "%Lg", 1.0L / zeroL) < 0 + || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0)) + result |= 1; + if (sprintf (buf, "%Lg", -1.0L / zeroL) < 0 + || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0)) + result |= 1; + if (sprintf (buf, "%Lg", zeroL / zeroL) < 0 + || !strisnan (buf, 0, strlen (buf))) + result |= 1; +#if CHECK_PRINTF_SAFE && ((defined __ia64 && LDBL_MANT_DIG == 64) || (defined __x86_64__ || defined __amd64__) || (defined __i386 || defined __i386__ || defined _I386 || defined _M_IX86 || defined _X86_)) && !HAVE_SAME_LONG_DOUBLE_AS_DOUBLE +/* Representation of an 80-bit 'long double' as an initializer for a sequence + of 'unsigned int' words. */ +# ifdef WORDS_BIGENDIAN +# define LDBL80_WORDS(exponent,manthi,mantlo) \ + { ((unsigned int) (exponent) << 16) | ((unsigned int) (manthi) >> 16), \ + ((unsigned int) (manthi) << 16) | ((unsigned int) (mantlo) >> 16), \ + (unsigned int) (mantlo) << 16 \ + } +# else +# define LDBL80_WORDS(exponent,manthi,mantlo) \ + { mantlo, manthi, exponent } +# endif + { /* Quiet NaN. */ + static union { unsigned int word[4]; long double value; } x = + { LDBL80_WORDS (0xFFFF, 0xC3333333, 0x00000000) }; + if (sprintf (buf, "%Lf", x.value) < 0 + || !strisnan (buf, 0, strlen (buf))) + result |= 2; + if (sprintf (buf, "%Le", x.value) < 0 + || !strisnan (buf, 0, strlen (buf))) + result |= 2; + if (sprintf (buf, "%Lg", x.value) < 0 + || !strisnan (buf, 0, strlen (buf))) + result |= 2; + } + { + /* Signalling NaN. */ + static union { unsigned int word[4]; long double value; } x = + { LDBL80_WORDS (0xFFFF, 0x83333333, 0x00000000) }; + if (sprintf (buf, "%Lf", x.value) < 0 + || !strisnan (buf, 0, strlen (buf))) + result |= 2; + if (sprintf (buf, "%Le", x.value) < 0 + || !strisnan (buf, 0, strlen (buf))) + result |= 2; + if (sprintf (buf, "%Lg", x.value) < 0 + || !strisnan (buf, 0, strlen (buf))) + result |= 2; + } + { /* Pseudo-NaN. */ + static union { unsigned int word[4]; long double value; } x = + { LDBL80_WORDS (0xFFFF, 0x40000001, 0x00000000) }; + if (sprintf (buf, "%Lf", x.value) <= 0) + result |= 4; + if (sprintf (buf, "%Le", x.value) <= 0) + result |= 4; + if (sprintf (buf, "%Lg", x.value) <= 0) + result |= 4; + } + { /* Pseudo-Infinity. */ + static union { unsigned int word[4]; long double value; } x = + { LDBL80_WORDS (0xFFFF, 0x00000000, 0x00000000) }; + if (sprintf (buf, "%Lf", x.value) <= 0) + result |= 8; + if (sprintf (buf, "%Le", x.value) <= 0) + result |= 8; + if (sprintf (buf, "%Lg", x.value) <= 0) + result |= 8; + } + { /* Pseudo-Zero. */ + static union { unsigned int word[4]; long double value; } x = + { LDBL80_WORDS (0x4004, 0x00000000, 0x00000000) }; + if (sprintf (buf, "%Lf", x.value) <= 0) + result |= 16; + if (sprintf (buf, "%Le", x.value) <= 0) + result |= 16; + if (sprintf (buf, "%Lg", x.value) <= 0) + result |= 16; + } + { /* Unnormalized number. */ + static union { unsigned int word[4]; long double value; } x = + { LDBL80_WORDS (0x4000, 0x63333333, 0x00000000) }; + if (sprintf (buf, "%Lf", x.value) <= 0) + result |= 32; + if (sprintf (buf, "%Le", x.value) <= 0) + result |= 32; + if (sprintf (buf, "%Lg", x.value) <= 0) + result |= 32; + } + { /* Pseudo-Denormal. */ + static union { unsigned int word[4]; long double value; } x = + { LDBL80_WORDS (0x0000, 0x83333333, 0x00000000) }; + if (sprintf (buf, "%Lf", x.value) <= 0) + result |= 64; + if (sprintf (buf, "%Le", x.value) <= 0) + result |= 64; + if (sprintf (buf, "%Lg", x.value) <= 0) + result |= 64; + } +#endif + return result; +}]])], + [gl_cv_func_printf_infinite_long_double=yes], + [gl_cv_func_printf_infinite_long_double=no], + [case "$host_cpu" in + # Guess no on ia64, x86_64, i386. + ia64 | x86_64 | i*86) gl_cv_func_printf_infinite_long_double="guessing no";; + *) + case "$host_os" in +changequote(,)dnl + # Guess yes on glibc systems. + *-gnu* | gnu*) gl_cv_func_printf_infinite_long_double="guessing yes";; + # Guess yes on musl systems. + *-musl* | midipix*) gl_cv_func_printf_infinite_long_double="guessing yes";; + # Guess yes on FreeBSD >= 6. + freebsd[1-5].*) gl_cv_func_printf_infinite_long_double="guessing no";; + freebsd* | kfreebsd*) gl_cv_func_printf_infinite_long_double="guessing yes";; + midnightbsd*) gl_cv_func_printf_infinite_long_double="guessing yes";; + # Guess yes on HP-UX >= 11. + hpux[7-9]* | hpux10*) gl_cv_func_printf_infinite_long_double="guessing no";; + hpux*) gl_cv_func_printf_infinite_long_double="guessing yes";; + # Guess yes on OpenBSD >= 6.0. + openbsd[1-5].*) gl_cv_func_printf_infinite_long_double="guessing no";; + openbsd*) gl_cv_func_printf_infinite_long_double="guessing yes";; + # Guess no on Android. + linux*-android*) gl_cv_func_printf_infinite_long_double="guessing no";; +changequote([,])dnl + # Guess yes on MSVC, no on mingw. + mingw*) AC_EGREP_CPP([Known], [ +#ifdef _MSC_VER + Known +#endif + ], + [gl_cv_func_printf_infinite_long_double="guessing yes"], + [gl_cv_func_printf_infinite_long_double="guessing no"]) + ;; + # If we don't know, obey --enable-cross-guesses. + *) gl_cv_func_printf_infinite_long_double="$gl_cross_guess_normal";; + esac + ;; + esac + ]) + ]) + ;; + *) + gl_cv_func_printf_infinite_long_double="irrelevant" + ;; + esac +]) + +dnl Test whether the *printf family of functions supports the 'a' and 'A' +dnl conversion specifier for hexadecimal output of floating-point numbers. +dnl (ISO C99, POSIX:2001) +dnl Result is gl_cv_func_printf_directive_a. + +AC_DEFUN([gl_PRINTF_DIRECTIVE_A], +[ + AC_REQUIRE([AC_PROG_CC]) + AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles + AC_CACHE_CHECK([whether printf supports the 'a' and 'A' directives], + [gl_cv_func_printf_directive_a], + [ + AC_RUN_IFELSE( + [AC_LANG_SOURCE([[ +#include <stdio.h> +#include <string.h> +static char buf[100]; +static double zero = 0.0; +int main () +{ + int result = 0; + if (sprintf (buf, "%a %d", 3.1416015625, 33, 44, 55) < 0 + || (strcmp (buf, "0x1.922p+1 33") != 0 + && strcmp (buf, "0x3.244p+0 33") != 0 + && strcmp (buf, "0x6.488p-1 33") != 0 + && strcmp (buf, "0xc.91p-2 33") != 0)) + result |= 1; + if (sprintf (buf, "%A %d", -3.1416015625, 33, 44, 55) < 0 + || (strcmp (buf, "-0X1.922P+1 33") != 0 + && strcmp (buf, "-0X3.244P+0 33") != 0 + && strcmp (buf, "-0X6.488P-1 33") != 0 + && strcmp (buf, "-0XC.91P-2 33") != 0)) + result |= 2; + /* This catches a FreeBSD 13.0 bug: it doesn't round. */ + if (sprintf (buf, "%.2a %d", 1.51, 33, 44, 55) < 0 + || (strcmp (buf, "0x1.83p+0 33") != 0 + && strcmp (buf, "0x3.05p-1 33") != 0 + && strcmp (buf, "0x6.0ap-2 33") != 0 + && strcmp (buf, "0xc.14p-3 33") != 0)) + result |= 4; + /* This catches a Mac OS X 10.12.4 (Darwin 16.5) bug: it doesn't round. */ + if (sprintf (buf, "%.0a %d", 1.51, 33, 44, 55) < 0 + || (strcmp (buf, "0x2p+0 33") != 0 + && strcmp (buf, "0x3p-1 33") != 0 + && strcmp (buf, "0x6p-2 33") != 0 + && strcmp (buf, "0xcp-3 33") != 0)) + result |= 4; + /* This catches a FreeBSD 6.1 bug. See + <https://lists.gnu.org/r/bug-gnulib/2007-04/msg00107.html> */ + if (sprintf (buf, "%010a %d", 1.0 / zero, 33, 44, 55) < 0 + || buf[0] == '0') + result |= 8; + /* This catches a Mac OS X 10.3.9 (Darwin 7.9) bug. */ + if (sprintf (buf, "%.1a", 1.999) < 0 + || (strcmp (buf, "0x1.0p+1") != 0 + && strcmp (buf, "0x2.0p+0") != 0 + && strcmp (buf, "0x4.0p-1") != 0 + && strcmp (buf, "0x8.0p-2") != 0)) + result |= 16; + /* This catches the same Mac OS X 10.3.9 (Darwin 7.9) bug and also a + glibc 2.4 bug <https://sourceware.org/bugzilla/show_bug.cgi?id=2908>. */ + if (sprintf (buf, "%.1La", 1.999L) < 0 + || (strcmp (buf, "0x1.0p+1") != 0 + && strcmp (buf, "0x2.0p+0") != 0 + && strcmp (buf, "0x4.0p-1") != 0 + && strcmp (buf, "0x8.0p-2") != 0)) + result |= 32; + return result; +}]])], + [gl_cv_func_printf_directive_a=yes], + [gl_cv_func_printf_directive_a=no], + [ + case "$host_os" in + # Guess yes on glibc >= 2.5 systems. + *-gnu* | gnu*) + AC_EGREP_CPP([BZ2908], [ + #include <features.h> + #ifdef __GNU_LIBRARY__ + #if ((__GLIBC__ == 2 && __GLIBC_MINOR__ >= 5) || (__GLIBC__ > 2)) && !defined __UCLIBC__ + BZ2908 + #endif + #endif + ], + [gl_cv_func_printf_directive_a="guessing yes"], + [gl_cv_func_printf_directive_a="guessing no"]) + ;; + # Guess yes on musl systems. + *-musl* | midipix*) gl_cv_func_printf_directive_a="guessing yes";; + # Guess no on Android. + linux*-android*) gl_cv_func_printf_directive_a="guessing no";; + # Guess no on native Windows. + mingw*) gl_cv_func_printf_directive_a="guessing no";; + # If we don't know, obey --enable-cross-guesses. + *) gl_cv_func_printf_directive_a="$gl_cross_guess_normal";; + esac + ]) + ]) +]) + +dnl Test whether the *printf family of functions supports the 'b' conversion +dnl specifier for binary output of integers. +dnl (ISO C23) +dnl Result is gl_cv_func_printf_directive_b. + +AC_DEFUN([gl_PRINTF_DIRECTIVE_B], +[ + AC_REQUIRE([AC_PROG_CC]) + AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles + AC_CACHE_CHECK([whether printf supports the 'b' directive], + [gl_cv_func_printf_directive_b], + [ + AC_RUN_IFELSE( + [AC_LANG_SOURCE([[ +#include <stdio.h> +#include <string.h> +static char buf[100]; +int main () +{ + int result = 0; + if (sprintf (buf, "%b %d", 12345, 33, 44, 55) < 0 + || strcmp (buf, "11000000111001 33") != 0) + result |= 1; + return result; +}]])], + [gl_cv_func_printf_directive_b=yes], + [gl_cv_func_printf_directive_b=no], + [ + case "$host_os" in + # Guess yes on glibc >= 2.35 systems. + *-gnu* | gnu*) + AC_EGREP_CPP([Lucky], [ + #include <features.h> + #ifdef __GNU_LIBRARY__ + #if (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 35) || (__GLIBC__ > 2) + Lucky user + #endif + #endif + ], + [gl_cv_func_printf_directive_uppercase_b="guessing yes"], + [gl_cv_func_printf_directive_uppercase_b="guessing no"]) + ;; + # Guess no on musl systems. + *-musl* | midipix*) gl_cv_func_printf_directive_b="guessing no";; + # Guess no on Android. + linux*-android*) gl_cv_func_printf_directive_b="guessing no";; + # Guess no on native Windows. + mingw*) gl_cv_func_printf_directive_b="guessing no";; + # If we don't know, obey --enable-cross-guesses. + *) gl_cv_func_printf_directive_b="$gl_cross_guess_normal";; + esac + ]) + ]) +]) + +dnl Test whether the *printf family of functions supports the 'B' conversion +dnl specifier for binary output of integers. +dnl (GNU, encouraged by ISO C23 ยง 7.23.6.1) +dnl Result is gl_cv_func_printf_directive_uppercase_b. + +AC_DEFUN([gl_PRINTF_DIRECTIVE_UPPERCASE_B], +[ + AC_REQUIRE([AC_PROG_CC]) + AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles + AC_CACHE_CHECK([whether printf supports the 'B' directive], + [gl_cv_func_printf_directive_uppercase_b], + [ + AC_RUN_IFELSE( + [AC_LANG_SOURCE([[ +#include <stdio.h> +#include <string.h> +static char buf[100]; +int main () +{ + int result = 0; + if (sprintf (buf, "%#B %d", 12345, 33, 44, 55) < 0 + || strcmp (buf, "0B11000000111001 33") != 0) + result |= 1; + return result; +}]])], + [gl_cv_func_printf_directive_uppercase_b=yes], + [gl_cv_func_printf_directive_uppercase_b=no], + [ + case "$host_os" in + # Guess yes on glibc >= 2.35 systems. + *-gnu* | gnu*) + AC_EGREP_CPP([Lucky], [ + #include <features.h> + #ifdef __GNU_LIBRARY__ + #if (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 35) || (__GLIBC__ > 2) + Lucky user + #endif + #endif + ], + [gl_cv_func_printf_directive_uppercase_b="guessing yes"], + [gl_cv_func_printf_directive_uppercase_b="guessing no"]) + ;; + # Guess no on musl systems. + *-musl* | midipix*) gl_cv_func_printf_directive_uppercase_b="guessing no";; + # Guess no on Android. + linux*-android*) gl_cv_func_printf_directive_uppercase_b="guessing no";; + # Guess no on native Windows. + mingw*) gl_cv_func_printf_directive_uppercase_b="guessing no";; + # If we don't know, obey --enable-cross-guesses. + *) gl_cv_func_printf_directive_uppercase_b="$gl_cross_guess_normal";; + esac + ]) + ]) +]) + +dnl Test whether the *printf family of functions supports the %F format +dnl directive. (ISO C99, POSIX:2001) +dnl Result is gl_cv_func_printf_directive_f. + +AC_DEFUN([gl_PRINTF_DIRECTIVE_F], +[ + AC_REQUIRE([AC_PROG_CC]) + AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles + AC_CACHE_CHECK([whether printf supports the 'F' directive], + [gl_cv_func_printf_directive_f], + [ + AC_RUN_IFELSE( + [AC_LANG_SOURCE([[ +#include <stdio.h> +#include <string.h> +static char buf[100]; +static double zero = 0.0; +int main () +{ + int result = 0; + if (sprintf (buf, "%F %d", 1234567.0, 33, 44, 55) < 0 + || strcmp (buf, "1234567.000000 33") != 0) + result |= 1; + if (sprintf (buf, "%F", 1.0 / zero) < 0 + || (strcmp (buf, "INF") != 0 && strcmp (buf, "INFINITY") != 0)) + result |= 2; + /* This catches a Cygwin 1.5.x bug. */ + if (sprintf (buf, "%.F", 1234.0) < 0 + || strcmp (buf, "1234") != 0) + result |= 4; + return result; +}]])], + [gl_cv_func_printf_directive_f=yes], + [gl_cv_func_printf_directive_f=no], + [ + case "$host_os" in +changequote(,)dnl + # Guess yes on glibc systems. + *-gnu* | gnu*) gl_cv_func_printf_directive_f="guessing yes";; + # Guess yes on musl systems. + *-musl* | midipix*) gl_cv_func_printf_directive_f="guessing yes";; + # Guess yes on FreeBSD >= 6. + freebsd[1-5].*) gl_cv_func_printf_directive_f="guessing no";; + freebsd* | kfreebsd*) gl_cv_func_printf_directive_f="guessing yes";; + midnightbsd*) gl_cv_func_printf_directive_f="guessing yes";; + # Guess yes on Mac OS X >= 10.3. + darwin[1-6].*) gl_cv_func_printf_directive_f="guessing no";; + darwin*) gl_cv_func_printf_directive_f="guessing yes";; + # Guess yes on OpenBSD >= 6.0. + openbsd[1-5].*) gl_cv_func_printf_directive_f="guessing no";; + openbsd*) gl_cv_func_printf_directive_f="guessing yes";; + # Guess yes on Solaris >= 2.10. + solaris2.[1-9][0-9]*) gl_cv_func_printf_directive_f="guessing yes";; + solaris*) gl_cv_func_printf_directive_f="guessing no";; + # Guess no on Android. + linux*-android*) gl_cv_func_printf_directive_f="guessing no";; +changequote([,])dnl + # Guess yes on MSVC, no on mingw. + mingw*) AC_EGREP_CPP([Known], [ +#ifdef _MSC_VER + Known +#endif + ], + [gl_cv_func_printf_directive_f="guessing yes"], + [gl_cv_func_printf_directive_f="guessing no"]) + ;; + # If we don't know, obey --enable-cross-guesses. + *) gl_cv_func_printf_directive_f="$gl_cross_guess_normal";; + esac + ]) + ]) +]) + +dnl Test whether the *printf family of functions supports the %n format +dnl directive. (ISO C99, POSIX:2001) +dnl Result is gl_cv_func_printf_directive_n. + +AC_DEFUN([gl_PRINTF_DIRECTIVE_N], +[ + AC_REQUIRE([AC_PROG_CC]) + AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles + AC_CACHE_CHECK([whether printf supports the 'n' directive], + [gl_cv_func_printf_directive_n], + [ + AC_RUN_IFELSE( + [AC_LANG_SOURCE([[ +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#ifdef _MSC_VER +#include <inttypes.h> +/* See page about "Parameter Validation" on msdn.microsoft.com. + <https://docs.microsoft.com/en-us/cpp/c-runtime-library/parameter-validation> + <https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/set-invalid-parameter-handler-set-thread-local-invalid-parameter-handler> */ +static void cdecl +invalid_parameter_handler (const wchar_t *expression, + const wchar_t *function, + const wchar_t *file, unsigned int line, + uintptr_t dummy) +{ + exit (1); +} +#endif +static char fmtstring[10]; +static char buf[100]; +int main () +{ + int count = -1; +#ifdef _MSC_VER + _set_invalid_parameter_handler (invalid_parameter_handler); +#endif + /* Copy the format string. Some systems (glibc with _FORTIFY_SOURCE=2) + support %n in format strings in read-only memory but not in writable + memory. */ + strcpy (fmtstring, "%d %n"); + if (sprintf (buf, fmtstring, 123, &count, 33, 44, 55) < 0 + || strcmp (buf, "123 ") != 0 + || count != 4) + return 1; + return 0; +}]])], + [gl_cv_func_printf_directive_n=yes], + [gl_cv_func_printf_directive_n=no], + [case "$host_os" in + # Guess no on glibc when _FORTIFY_SOURCE >= 2. + *-gnu* | gnu*) AC_COMPILE_IFELSE( + [AC_LANG_SOURCE( + [[#if _FORTIFY_SOURCE >= 2 + error fail + #endif + ]])], + [gl_cv_func_printf_directive_n="guessing yes"], + [gl_cv_func_printf_directive_n="guessing no"]) + ;; + # Guess no on Android. + linux*-android*) gl_cv_func_printf_directive_n="guessing no";; + # Guess no on native Windows. + mingw*) gl_cv_func_printf_directive_n="guessing no";; + *) gl_cv_func_printf_directive_n="guessing yes";; + esac + ]) + ]) +]) + +dnl Test whether the *printf family of functions supports the %ls format +dnl directive and in particular, when a precision is specified, whether +dnl the functions stop converting the wide string argument when the number +dnl of bytes that have been produced by this conversion equals or exceeds +dnl the precision. +dnl Result is gl_cv_func_printf_directive_ls. + +AC_DEFUN([gl_PRINTF_DIRECTIVE_LS], +[ + AC_REQUIRE([AC_PROG_CC]) + AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles + AC_CACHE_CHECK([whether printf supports the 'ls' directive], + [gl_cv_func_printf_directive_ls], + [ + AC_RUN_IFELSE( + [AC_LANG_SOURCE([[ +#include <stdio.h> +#include <wchar.h> +#include <string.h> +int main () +{ + int result = 0; + char buf[100]; + /* Test whether %ls works at all. + This test fails on OpenBSD 4.0, IRIX 6.5, Solaris 2.6, Haiku, but not on + Cygwin 1.5. */ + { + static const wchar_t wstring[] = { 'a', 'b', 'c', 0 }; + buf[0] = '\0'; + if (sprintf (buf, "%ls", wstring) < 0 + || strcmp (buf, "abc") != 0) + result |= 1; + } + /* This test fails on IRIX 6.5, Solaris 2.6, Cygwin 1.5, Haiku (with an + assertion failure inside libc), but not on OpenBSD 4.0. */ + { + static const wchar_t wstring[] = { 'a', 0 }; + buf[0] = '\0'; + if (sprintf (buf, "%ls", wstring) < 0 + || strcmp (buf, "a") != 0) + result |= 2; + } + /* Test whether precisions in %ls are supported as specified in ISO C 99 + section 7.19.6.1: + "If a precision is specified, no more than that many bytes are written + (including shift sequences, if any), and the array shall contain a + null wide character if, to equal the multibyte character sequence + length given by the precision, the function would need to access a + wide character one past the end of the array." + This test fails on Solaris 10. */ + { + static const wchar_t wstring[] = { 'a', 'b', (wchar_t) 0xfdfdfdfd, 0 }; + buf[0] = '\0'; + if (sprintf (buf, "%.2ls", wstring) < 0 + || strcmp (buf, "ab") != 0) + result |= 8; + } + return result; +}]])], + [gl_cv_func_printf_directive_ls=yes], + [gl_cv_func_printf_directive_ls=no], + [ +changequote(,)dnl + case "$host_os" in + # Guess yes on OpenBSD >= 6.0. + openbsd[1-5].*) gl_cv_func_printf_directive_ls="guessing no";; + openbsd*) gl_cv_func_printf_directive_ls="guessing yes";; + irix*) gl_cv_func_printf_directive_ls="guessing no";; + solaris*) gl_cv_func_printf_directive_ls="guessing no";; + cygwin*) gl_cv_func_printf_directive_ls="guessing no";; + beos* | haiku*) gl_cv_func_printf_directive_ls="guessing no";; + # Guess no on Android. + linux*-android*) gl_cv_func_printf_directive_ls="guessing no";; + # Guess yes on native Windows. + mingw*) gl_cv_func_printf_directive_ls="guessing yes";; + *) gl_cv_func_printf_directive_ls="guessing yes";; + esac +changequote([,])dnl + ]) + ]) +]) + +dnl Test whether the *printf family of functions supports the %lc format +dnl directive and in particular, when the argument is a null wide character, +dnl whether the functions don't produce a NUL byte. +dnl Result is gl_cv_func_printf_directive_lc. + +AC_DEFUN([gl_PRINTF_DIRECTIVE_LC], +[ + AC_REQUIRE([AC_PROG_CC]) + AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles + AC_CACHE_CHECK([whether printf supports the 'lc' directive correctly], + [gl_cv_func_printf_directive_lc], + [ + AC_RUN_IFELSE( + [AC_LANG_SOURCE([[ +#include <stdio.h> +#include <wchar.h> +#include <string.h> +int main () +{ + int result = 0; + char buf[100]; + /* This test fails on glibc 2.35, FreeBSD 13.1, NetBSD 9.0, OpenBSD 7.2, + macOS 12.5, AIX 7.2, Solaris 11.4. + glibc 2.35 bug: <https://sourceware.org/bugzilla/show_bug.cgi?id=30257> */ + { + buf[0] = '\0'; + if (sprintf (buf, "%lc%lc%lc", (wint_t) 'a', (wint_t) 0, (wint_t) 'z') < 0 + || strcmp (buf, "az") != 0) + result |= 1; + } + return result; +}]])], + [gl_cv_func_printf_directive_lc=yes], + [gl_cv_func_printf_directive_lc=no], + [ +changequote(,)dnl + case "$host_os" in + # Guess yes on musl libc. + *-musl* | midipix*) gl_cv_func_printf_directive_lc="guessing yes";; + # Guess no otherwise. + *) gl_cv_func_printf_directive_lc="guessing no";; + esac +changequote([,])dnl + ]) + ]) +]) + +dnl Test whether the *printf family of functions supports POSIX/XSI format +dnl strings with positions. (POSIX:2001) +dnl Result is gl_cv_func_printf_positions. + +AC_DEFUN_ONCE([gl_PRINTF_POSITIONS], +[ + AC_REQUIRE([AC_PROG_CC]) + AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles + AC_CACHE_CHECK([whether printf supports POSIX/XSI format strings with positions], + [gl_cv_func_printf_positions], + [ + AC_RUN_IFELSE( + [AC_LANG_SOURCE([[ +#include <stdio.h> +#include <string.h> +/* The string "%2$d %1$d", with dollar characters protected from the shell's + dollar expansion (possibly an autoconf bug). */ +static char format[] = { '%', '2', '$', 'd', ' ', '%', '1', '$', 'd', '\0' }; +static char buf[100]; +int main () +{ + sprintf (buf, format, 33, 55); + return (strcmp (buf, "55 33") != 0); +}]])], + [gl_cv_func_printf_positions=yes], + [gl_cv_func_printf_positions=no], + [ +changequote(,)dnl + case "$host_os" in + netbsd[1-3]* | netbsdelf[1-3]* | netbsdaout[1-3]* | netbsdcoff[1-3]*) + gl_cv_func_printf_positions="guessing no";; + beos*) gl_cv_func_printf_positions="guessing no";; + # Guess yes on Android. + linux*-android*) gl_cv_func_printf_positions="guessing yes";; + # Guess no on native Windows. + mingw* | pw*) gl_cv_func_printf_positions="guessing no";; + *) gl_cv_func_printf_positions="guessing yes";; + esac +changequote([,])dnl + ]) + ]) +]) + +dnl Test whether the *printf family of functions supports POSIX/XSI format +dnl strings with the ' flag for grouping of decimal digits. (POSIX:2001) +dnl Result is gl_cv_func_printf_flag_grouping. + +AC_DEFUN([gl_PRINTF_FLAG_GROUPING], +[ + AC_REQUIRE([AC_PROG_CC]) + AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles + AC_CACHE_CHECK([whether printf supports the grouping flag], + [gl_cv_func_printf_flag_grouping], + [ + AC_RUN_IFELSE( + [AC_LANG_SOURCE([[ +#include <stdio.h> +#include <string.h> +static char buf[100]; +int main () +{ + if (sprintf (buf, "%'d %d", 1234567, 99) < 0 + || buf[strlen (buf) - 1] != '9') + return 1; + return 0; +}]])], + [gl_cv_func_printf_flag_grouping=yes], + [gl_cv_func_printf_flag_grouping=no], + [ +changequote(,)dnl + case "$host_os" in + cygwin*) gl_cv_func_printf_flag_grouping="guessing no";; + netbsd*) gl_cv_func_printf_flag_grouping="guessing no";; + # Guess no on Android. + linux*-android*) gl_cv_func_printf_flag_grouping="guessing no";; + # Guess no on native Windows. + mingw* | pw*) gl_cv_func_printf_flag_grouping="guessing no";; + *) gl_cv_func_printf_flag_grouping="guessing yes";; + esac +changequote([,])dnl + ]) + ]) +]) + +dnl Test whether the *printf family of functions supports the - flag correctly. +dnl (ISO C99.) See +dnl <https://lists.gnu.org/r/bug-coreutils/2008-02/msg00035.html> +dnl Result is gl_cv_func_printf_flag_leftadjust. + +AC_DEFUN([gl_PRINTF_FLAG_LEFTADJUST], +[ + AC_REQUIRE([AC_PROG_CC]) + AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles + AC_CACHE_CHECK([whether printf supports the left-adjust flag correctly], + [gl_cv_func_printf_flag_leftadjust], + [ + AC_RUN_IFELSE( + [AC_LANG_SOURCE([[ +#include <stdio.h> +#include <string.h> +static char buf[100]; +int main () +{ + /* Check that a '-' flag is not annihilated by a negative width. */ + if (sprintf (buf, "a%-*sc", -3, "b") < 0 + || strcmp (buf, "ab c") != 0) + return 1; + return 0; +}]])], + [gl_cv_func_printf_flag_leftadjust=yes], + [gl_cv_func_printf_flag_leftadjust=no], + [ +changequote(,)dnl + case "$host_os" in + # Guess yes on HP-UX 11. + hpux11*) gl_cv_func_printf_flag_leftadjust="guessing yes";; + # Guess no on HP-UX 10 and older. + hpux*) gl_cv_func_printf_flag_leftadjust="guessing no";; + # Guess yes on Android. + linux*-android*) gl_cv_func_printf_flag_leftadjust="guessing yes";; + # Guess yes on native Windows. + mingw*) gl_cv_func_printf_flag_leftadjust="guessing yes";; + # Guess yes otherwise. + *) gl_cv_func_printf_flag_leftadjust="guessing yes";; + esac +changequote([,])dnl + ]) + ]) +]) + +dnl Test whether the *printf family of functions supports padding of non-finite +dnl values with the 0 flag correctly. (ISO C99 + TC1 + TC2.) See +dnl <https://lists.gnu.org/r/bug-gnulib/2007-04/msg00107.html> +dnl Result is gl_cv_func_printf_flag_zero. + +AC_DEFUN([gl_PRINTF_FLAG_ZERO], +[ + AC_REQUIRE([AC_PROG_CC]) + AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles + AC_CACHE_CHECK([whether printf supports the zero flag correctly], + [gl_cv_func_printf_flag_zero], + [ + AC_RUN_IFELSE( + [AC_LANG_SOURCE([[ +#include <stdio.h> +#include <string.h> +static char buf[100]; +static double zero = 0.0; +int main () +{ + if (sprintf (buf, "%010f", 1.0 / zero, 33, 44, 55) < 0 + || (strcmp (buf, " inf") != 0 + && strcmp (buf, " infinity") != 0)) + return 1; + return 0; +}]])], + [gl_cv_func_printf_flag_zero=yes], + [gl_cv_func_printf_flag_zero=no], + [ +changequote(,)dnl + case "$host_os" in + # Guess yes on glibc systems. + *-gnu* | gnu*) gl_cv_func_printf_flag_zero="guessing yes";; + # Guess yes on musl systems. + *-musl* | midipix*) gl_cv_func_printf_flag_zero="guessing yes";; + # Guess yes on BeOS. + beos*) gl_cv_func_printf_flag_zero="guessing yes";; + # Guess no on Android. + linux*-android*) gl_cv_func_printf_flag_zero="guessing no";; + # Guess no on native Windows. + mingw*) gl_cv_func_printf_flag_zero="guessing no";; + # If we don't know, obey --enable-cross-guesses. + *) gl_cv_func_printf_flag_zero="$gl_cross_guess_normal";; + esac +changequote([,])dnl + ]) + ]) +]) + +dnl Test whether the *printf family of functions supports large precisions. +dnl On mingw, precisions larger than 512 are treated like 512, in integer, +dnl floating-point or pointer output. On Solaris 10/x86, precisions larger +dnl than 510 in floating-point output crash the program. On Solaris 10/SPARC, +dnl precisions larger than 510 in floating-point output yield wrong results. +dnl On AIX 7.1, precisions larger than 998 in floating-point output yield +dnl wrong results. On BeOS, precisions larger than 1044 crash the program. +dnl Result is gl_cv_func_printf_precision. + +AC_DEFUN([gl_PRINTF_PRECISION], +[ + AC_REQUIRE([AC_PROG_CC]) + AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles + AC_CACHE_CHECK([whether printf supports large precisions], + [gl_cv_func_printf_precision], + [ + AC_RUN_IFELSE( + [AC_LANG_SOURCE([[ +#include <stdio.h> +#include <string.h> +static char buf[5000]; +int main () +{ + int result = 0; +#ifdef __BEOS__ + /* On BeOS, this would crash and show a dialog box. Avoid the crash. */ + return 1; +#endif + if (sprintf (buf, "%.4000d %d", 1, 33, 44) < 4000 + 3) + result |= 1; + if (sprintf (buf, "%.4000f %d", 1.0, 33, 44) < 4000 + 5) + result |= 2; + if (sprintf (buf, "%.511f %d", 1.0, 33, 44) < 511 + 5 + || buf[0] != '1') + result |= 4; + if (sprintf (buf, "%.999f %d", 1.0, 33, 44) < 999 + 5 + || buf[0] != '1') + result |= 4; + return result; +}]])], + [gl_cv_func_printf_precision=yes], + [gl_cv_func_printf_precision=no], + [ +changequote(,)dnl + case "$host_os" in + # Guess no only on Solaris, native Windows, and BeOS systems. + solaris*) gl_cv_func_printf_precision="guessing no" ;; + mingw* | pw*) gl_cv_func_printf_precision="guessing no" ;; + beos*) gl_cv_func_printf_precision="guessing no" ;; + # Guess yes on Android. + linux*-android*) gl_cv_func_printf_precision="guessing yes" ;; + *) gl_cv_func_printf_precision="guessing yes" ;; + esac +changequote([,])dnl + ]) + ]) +]) + +dnl Test whether the *printf family of functions recovers gracefully in case +dnl of an out-of-memory condition, or whether it crashes the entire program. +dnl Result is gl_cv_func_printf_enomem. + +AC_DEFUN([gl_PRINTF_ENOMEM], +[ + AC_REQUIRE([AC_PROG_CC]) + AC_REQUIRE([gl_MULTIARCH]) + AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles + AC_CACHE_CHECK([whether printf survives out-of-memory conditions], + [gl_cv_func_printf_enomem], + [ + gl_cv_func_printf_enomem="guessing no" + if test "$cross_compiling" = no; then + if test $APPLE_UNIVERSAL_BUILD = 0; then + AC_LANG_CONFTEST([AC_LANG_SOURCE([[ +]GL_NOCRASH[ +#include <stdio.h> +#include <sys/types.h> +#include <sys/time.h> +#include <sys/resource.h> +#include <errno.h> +int main() +{ + struct rlimit limit; + int ret; + nocrash_init (); + /* Some printf implementations allocate temporary space with malloc. */ + /* On BSD systems, malloc() is limited by RLIMIT_DATA. */ +#ifdef RLIMIT_DATA + if (getrlimit (RLIMIT_DATA, &limit) < 0) + return 77; + if (limit.rlim_max == RLIM_INFINITY || limit.rlim_max > 5000000) + limit.rlim_max = 5000000; + limit.rlim_cur = limit.rlim_max; + if (setrlimit (RLIMIT_DATA, &limit) < 0) + return 77; +#endif + /* On Linux systems, malloc() is limited by RLIMIT_AS. */ +#ifdef RLIMIT_AS + if (getrlimit (RLIMIT_AS, &limit) < 0) + return 77; + if (limit.rlim_max == RLIM_INFINITY || limit.rlim_max > 5000000) + limit.rlim_max = 5000000; + limit.rlim_cur = limit.rlim_max; + if (setrlimit (RLIMIT_AS, &limit) < 0) + return 77; +#endif + /* Some printf implementations allocate temporary space on the stack. */ +#ifdef RLIMIT_STACK + if (getrlimit (RLIMIT_STACK, &limit) < 0) + return 77; + if (limit.rlim_max == RLIM_INFINITY || limit.rlim_max > 5000000) + limit.rlim_max = 5000000; + limit.rlim_cur = limit.rlim_max; + if (setrlimit (RLIMIT_STACK, &limit) < 0) + return 77; +#endif + ret = printf ("%.5000000f", 1.0); + return !(ret == 5000002 || (ret < 0 && errno == ENOMEM)); +} + ]])]) + if AC_TRY_EVAL([ac_link]) && test -s conftest$ac_exeext; then + (./conftest 2>&AS_MESSAGE_LOG_FD + result=$? + _AS_ECHO_LOG([\$? = $result]) + if test $result != 0 && test $result != 77; then result=1; fi + exit $result + ) >/dev/null 2>/dev/null + case $? in + 0) gl_cv_func_printf_enomem="yes" ;; + 77) gl_cv_func_printf_enomem="guessing no" ;; + *) gl_cv_func_printf_enomem="no" ;; + esac + else + gl_cv_func_printf_enomem="guessing no" + fi + rm -fr conftest* + else + dnl A universal build on Apple Mac OS X platforms. + dnl The result would be 'no' in 32-bit mode and 'yes' in 64-bit mode. + dnl But we need a configuration result that is valid in both modes. + gl_cv_func_printf_enomem="guessing no" + fi + fi + if test "$gl_cv_func_printf_enomem" = "guessing no"; then +changequote(,)dnl + case "$host_os" in + # Guess yes on glibc systems. + *-gnu* | gnu*) gl_cv_func_printf_enomem="guessing yes";; + # Guess yes on Solaris. + solaris*) gl_cv_func_printf_enomem="guessing yes";; + # Guess yes on AIX. + aix*) gl_cv_func_printf_enomem="guessing yes";; + # Guess yes on HP-UX/hppa. + hpux*) case "$host_cpu" in + hppa*) gl_cv_func_printf_enomem="guessing yes";; + *) gl_cv_func_printf_enomem="guessing no";; + esac + ;; + # Guess yes on IRIX. + irix*) gl_cv_func_printf_enomem="guessing yes";; + # Guess yes on OSF/1. + osf*) gl_cv_func_printf_enomem="guessing yes";; + # Guess yes on BeOS. + beos*) gl_cv_func_printf_enomem="guessing yes";; + # Guess yes on Haiku. + haiku*) gl_cv_func_printf_enomem="guessing yes";; + # Guess no on Android. + linux*-android*) gl_cv_func_printf_enomem="guessing no";; + # If we don't know, obey --enable-cross-guesses. + *) gl_cv_func_printf_enomem="$gl_cross_guess_normal";; + esac +changequote([,])dnl + fi + ]) +]) + +dnl Test whether the snprintf function exists. (ISO C99, POSIX:2001) +dnl Result is ac_cv_func_snprintf. + +AC_DEFUN([gl_SNPRINTF_PRESENCE], +[ + AC_CHECK_FUNCS_ONCE([snprintf]) +]) + +dnl Test whether the string produced by the snprintf function is always NUL +dnl terminated. (ISO C99, POSIX:2001) +dnl Result is gl_cv_func_snprintf_truncation_c99. + +AC_DEFUN_ONCE([gl_SNPRINTF_TRUNCATION_C99], +[ + AC_REQUIRE([AC_PROG_CC]) + AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles + AC_REQUIRE([gl_SNPRINTF_PRESENCE]) + AC_CACHE_CHECK([whether snprintf truncates the result as in C99], + [gl_cv_func_snprintf_truncation_c99], + [ + AC_RUN_IFELSE( + [AC_LANG_SOURCE([[ +#include <stdio.h> +#include <string.h> +#if HAVE_SNPRINTF +# define my_snprintf snprintf +#else +# include <stdarg.h> +static int my_snprintf (char *buf, int size, const char *format, ...) +{ + va_list args; + int ret; + va_start (args, format); + ret = vsnprintf (buf, size, format, args); + va_end (args); + return ret; +} +#endif +static char buf[100]; +int main () +{ + strcpy (buf, "ABCDEF"); + my_snprintf (buf, 3, "%d %d", 4567, 89); + if (memcmp (buf, "45\0DEF", 6) != 0) + return 1; + return 0; +}]])], + [gl_cv_func_snprintf_truncation_c99=yes], + [gl_cv_func_snprintf_truncation_c99=no], + [ +changequote(,)dnl + case "$host_os" in + # Guess yes on glibc systems. + *-gnu* | gnu*) gl_cv_func_snprintf_truncation_c99="guessing yes";; + # Guess yes on musl systems. + *-musl* | midipix*) gl_cv_func_snprintf_truncation_c99="guessing yes";; + # Guess yes on FreeBSD >= 5. + freebsd[1-4].*) gl_cv_func_snprintf_truncation_c99="guessing no";; + freebsd* | kfreebsd*) gl_cv_func_snprintf_truncation_c99="guessing yes";; + midnightbsd*) gl_cv_func_snprintf_truncation_c99="guessing yes";; + # Guess yes on Mac OS X >= 10.3. + darwin[1-6].*) gl_cv_func_snprintf_truncation_c99="guessing no";; + darwin*) gl_cv_func_snprintf_truncation_c99="guessing yes";; + # Guess yes on OpenBSD >= 3.9. + openbsd[1-2].* | openbsd3.[0-8] | openbsd3.[0-8].*) + gl_cv_func_snprintf_truncation_c99="guessing no";; + openbsd*) gl_cv_func_snprintf_truncation_c99="guessing yes";; + # Guess yes on Solaris >= 2.6. + solaris2.[0-5] | solaris2.[0-5].*) + gl_cv_func_snprintf_truncation_c99="guessing no";; + solaris*) gl_cv_func_snprintf_truncation_c99="guessing yes";; + # Guess yes on AIX >= 4. + aix[1-3]*) gl_cv_func_snprintf_truncation_c99="guessing no";; + aix*) gl_cv_func_snprintf_truncation_c99="guessing yes";; + # Guess yes on HP-UX >= 11. + hpux[7-9]* | hpux10*) gl_cv_func_snprintf_truncation_c99="guessing no";; + hpux*) gl_cv_func_snprintf_truncation_c99="guessing yes";; + # Guess yes on IRIX >= 6.5. + irix6.5) gl_cv_func_snprintf_truncation_c99="guessing yes";; + # Guess yes on OSF/1 >= 5. + osf[3-4]*) gl_cv_func_snprintf_truncation_c99="guessing no";; + osf*) gl_cv_func_snprintf_truncation_c99="guessing yes";; + # Guess yes on NetBSD >= 3. + netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*) + gl_cv_func_snprintf_truncation_c99="guessing no";; + netbsd*) gl_cv_func_snprintf_truncation_c99="guessing yes";; + # Guess yes on BeOS. + beos*) gl_cv_func_snprintf_truncation_c99="guessing yes";; + # Guess yes on Android. + linux*-android*) gl_cv_func_snprintf_truncation_c99="guessing yes";; + # Guess no on native Windows. + mingw*) gl_cv_func_snprintf_truncation_c99="guessing no";; + # If we don't know, obey --enable-cross-guesses. + *) gl_cv_func_snprintf_truncation_c99="$gl_cross_guess_normal";; + esac +changequote([,])dnl + ]) + ]) +]) + +dnl Test whether the return value of the snprintf function is the number +dnl of bytes (excluding the terminating NUL) that would have been produced +dnl if the buffer had been large enough. (ISO C99, POSIX:2001) +dnl For example, this test program fails on IRIX 6.5: +dnl --------------------------------------------------------------------- +dnl #include <stdio.h> +dnl int main() +dnl { +dnl static char buf[8]; +dnl int retval = snprintf (buf, 3, "%d", 12345); +dnl return retval >= 0 && retval < 3; +dnl } +dnl --------------------------------------------------------------------- +dnl Result is gl_cv_func_snprintf_retval_c99. + +AC_DEFUN_ONCE([gl_SNPRINTF_RETVAL_C99], +[ + AC_REQUIRE([AC_PROG_CC]) + AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles + AC_REQUIRE([gl_SNPRINTF_PRESENCE]) + AC_CACHE_CHECK([whether snprintf returns a byte count as in C99], + [gl_cv_func_snprintf_retval_c99], + [ + AC_RUN_IFELSE( + [AC_LANG_SOURCE([[ +#include <stdio.h> +#include <string.h> +#if HAVE_SNPRINTF +# define my_snprintf snprintf +#else +# include <stdarg.h> +static int my_snprintf (char *buf, int size, const char *format, ...) +{ + va_list args; + int ret; + va_start (args, format); + ret = vsnprintf (buf, size, format, args); + va_end (args); + return ret; +} +#endif +static char buf[100]; +int main () +{ + strcpy (buf, "ABCDEF"); + if (my_snprintf (buf, 3, "%d %d", 4567, 89) != 7) + return 1; + if (my_snprintf (buf, 0, "%d %d", 4567, 89) != 7) + return 2; + if (my_snprintf (NULL, 0, "%d %d", 4567, 89) != 7) + return 3; + return 0; +}]])], + [gl_cv_func_snprintf_retval_c99=yes], + [gl_cv_func_snprintf_retval_c99=no], + [case "$host_os" in +changequote(,)dnl + # Guess yes on glibc systems. + *-gnu* | gnu*) gl_cv_func_snprintf_retval_c99="guessing yes";; + # Guess yes on musl systems. + *-musl* | midipix*) gl_cv_func_snprintf_retval_c99="guessing yes";; + # Guess yes on FreeBSD >= 5. + freebsd[1-4].*) gl_cv_func_snprintf_retval_c99="guessing no";; + freebsd* | kfreebsd*) gl_cv_func_snprintf_retval_c99="guessing yes";; + midnightbsd*) gl_cv_func_snprintf_retval_c99="guessing yes";; + # Guess yes on Mac OS X >= 10.3. + darwin[1-6].*) gl_cv_func_snprintf_retval_c99="guessing no";; + darwin*) gl_cv_func_snprintf_retval_c99="guessing yes";; + # Guess yes on OpenBSD >= 3.9. + openbsd[1-2].* | openbsd3.[0-8] | openbsd3.[0-8].*) + gl_cv_func_snprintf_retval_c99="guessing no";; + openbsd*) gl_cv_func_snprintf_retval_c99="guessing yes";; + # Guess yes on Solaris >= 2.10. + solaris2.[1-9][0-9]*) gl_cv_func_printf_sizes_c99="guessing yes";; + solaris*) gl_cv_func_printf_sizes_c99="guessing no";; + # Guess yes on AIX >= 4. + aix[1-3]*) gl_cv_func_snprintf_retval_c99="guessing no";; + aix*) gl_cv_func_snprintf_retval_c99="guessing yes";; + # Guess yes on NetBSD >= 3. + netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*) + gl_cv_func_snprintf_retval_c99="guessing no";; + netbsd*) gl_cv_func_snprintf_retval_c99="guessing yes";; + # Guess yes on BeOS. + beos*) gl_cv_func_snprintf_retval_c99="guessing yes";; + # Guess yes on Android. + linux*-android*) gl_cv_func_snprintf_retval_c99="guessing yes";; +changequote([,])dnl + # Guess yes on MSVC, no on mingw. + mingw*) AC_EGREP_CPP([Known], [ +#ifdef _MSC_VER + Known +#endif + ], + [gl_cv_func_snprintf_retval_c99="guessing yes"], + [gl_cv_func_snprintf_retval_c99="guessing no"]) + ;; + # If we don't know, obey --enable-cross-guesses. + *) gl_cv_func_snprintf_retval_c99="$gl_cross_guess_normal";; + esac + ]) + ]) +]) + +dnl Test whether the snprintf function supports the %n format directive +dnl also in truncated portions of the format string. (ISO C99, POSIX:2001) +dnl Result is gl_cv_func_snprintf_directive_n. + +AC_DEFUN([gl_SNPRINTF_DIRECTIVE_N], +[ + AC_REQUIRE([AC_PROG_CC]) + AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles + AC_REQUIRE([gl_SNPRINTF_PRESENCE]) + AC_CACHE_CHECK([whether snprintf fully supports the 'n' directive], + [gl_cv_func_snprintf_directive_n], + [ + AC_RUN_IFELSE( + [AC_LANG_SOURCE([[ +#include <stdio.h> +#include <string.h> +#if HAVE_SNPRINTF +# define my_snprintf snprintf +#else +# include <stdarg.h> +static int my_snprintf (char *buf, int size, const char *format, ...) +{ + va_list args; + int ret; + va_start (args, format); + ret = vsnprintf (buf, size, format, args); + va_end (args); + return ret; +} +#endif +static char fmtstring[10]; +static char buf[100]; +int main () +{ + int count = -1; + /* Copy the format string. Some systems (glibc with _FORTIFY_SOURCE=2) + support %n in format strings in read-only memory but not in writable + memory. */ + strcpy (fmtstring, "%d %n"); + my_snprintf (buf, 4, fmtstring, 12345, &count, 33, 44, 55); + if (count != 6) + return 1; + return 0; +}]])], + [gl_cv_func_snprintf_directive_n=yes], + [gl_cv_func_snprintf_directive_n=no], + [ + case "$host_os" in + # Guess no on glibc when _FORTIFY_SOURCE >= 2. + *-gnu* | gnu*) AC_COMPILE_IFELSE( + [AC_LANG_SOURCE( + [[#if _FORTIFY_SOURCE >= 2 + error fail + #endif + ]])], + [gl_cv_func_snprintf_directive_n="guessing yes"], + [gl_cv_func_snprintf_directive_n="guessing no"]) + ;; +changequote(,)dnl + # Guess yes on musl systems. + *-musl* | midipix*) gl_cv_func_snprintf_directive_n="guessing yes";; + # Guess yes on FreeBSD >= 5. + freebsd[1-4].*) gl_cv_func_snprintf_directive_n="guessing no";; + freebsd* | kfreebsd*) gl_cv_func_snprintf_directive_n="guessing yes";; + midnightbsd*) gl_cv_func_snprintf_directive_n="guessing yes";; + # Guess yes on Mac OS X >= 10.3. + darwin[1-6].*) gl_cv_func_snprintf_directive_n="guessing no";; + darwin*) gl_cv_func_snprintf_directive_n="guessing yes";; + # Guess yes on Solaris >= 2.6. + solaris2.[0-5] | solaris2.[0-5].*) + gl_cv_func_snprintf_directive_n="guessing no";; + solaris*) gl_cv_func_snprintf_directive_n="guessing yes";; + # Guess yes on AIX >= 4. + aix[1-3]*) gl_cv_func_snprintf_directive_n="guessing no";; + aix*) gl_cv_func_snprintf_directive_n="guessing yes";; + # Guess yes on IRIX >= 6.5. + irix6.5) gl_cv_func_snprintf_directive_n="guessing yes";; + # Guess yes on OSF/1 >= 5. + osf[3-4]*) gl_cv_func_snprintf_directive_n="guessing no";; + osf*) gl_cv_func_snprintf_directive_n="guessing yes";; + # Guess yes on NetBSD >= 3. + netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*) + gl_cv_func_snprintf_directive_n="guessing no";; + netbsd*) gl_cv_func_snprintf_directive_n="guessing yes";; + # Guess yes on BeOS. + beos*) gl_cv_func_snprintf_directive_n="guessing yes";; + # Guess no on Android. + linux*-android*) gl_cv_func_snprintf_directive_n="guessing no";; + # Guess no on native Windows. + mingw*) gl_cv_func_snprintf_directive_n="guessing no";; + # If we don't know, obey --enable-cross-guesses. + *) gl_cv_func_snprintf_directive_n="$gl_cross_guess_normal";; +changequote([,])dnl + esac + ]) + ]) +]) + +dnl Test whether the snprintf function, when passed a size = 1, writes any +dnl output without bounds in this case, behaving like sprintf. This is the +dnl case on Linux libc5. +dnl Result is gl_cv_func_snprintf_size1. + +AC_DEFUN([gl_SNPRINTF_SIZE1], +[ + AC_REQUIRE([AC_PROG_CC]) + AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles + AC_REQUIRE([gl_SNPRINTF_PRESENCE]) + AC_CACHE_CHECK([whether snprintf respects a size of 1], + [gl_cv_func_snprintf_size1], + [ + AC_RUN_IFELSE( + [AC_LANG_SOURCE([[ +#include <stdio.h> +#if HAVE_SNPRINTF +# define my_snprintf snprintf +#else +# include <stdarg.h> +static int my_snprintf (char *buf, int size, const char *format, ...) +{ + va_list args; + int ret; + va_start (args, format); + ret = vsnprintf (buf, size, format, args); + va_end (args); + return ret; +} +#endif +int main() +{ + static char buf[8] = { 'D', 'E', 'A', 'D', 'B', 'E', 'E', 'F' }; + my_snprintf (buf, 1, "%d", 12345); + return buf[1] != 'E'; +}]])], + [gl_cv_func_snprintf_size1=yes], + [gl_cv_func_snprintf_size1=no], + [case "$host_os" in + # Guess yes on Android. + linux*-android*) gl_cv_func_snprintf_size1="guessing yes" ;; + # Guess yes on native Windows. + mingw*) gl_cv_func_snprintf_size1="guessing yes" ;; + *) gl_cv_func_snprintf_size1="guessing yes" ;; + esac + ]) + ]) +]) + +dnl Test whether the vsnprintf function, when passed a zero size, produces no +dnl output. (ISO C99, POSIX:2001) +dnl For example, snprintf nevertheless writes a NUL byte in this case +dnl on OSF/1 5.1: +dnl --------------------------------------------------------------------- +dnl #include <stdio.h> +dnl int main() +dnl { +dnl static char buf[8] = { 'D', 'E', 'A', 'D', 'B', 'E', 'E', 'F' }; +dnl snprintf (buf, 0, "%d", 12345); +dnl return buf[0] != 'D'; +dnl } +dnl --------------------------------------------------------------------- +dnl And vsnprintf writes any output without bounds in this case, behaving like +dnl vsprintf, on HP-UX 11 and OSF/1 5.1: +dnl --------------------------------------------------------------------- +dnl #include <stdarg.h> +dnl #include <stdio.h> +dnl static int my_snprintf (char *buf, int size, const char *format, ...) +dnl { +dnl va_list args; +dnl int ret; +dnl va_start (args, format); +dnl ret = vsnprintf (buf, size, format, args); +dnl va_end (args); +dnl return ret; +dnl } +dnl int main() +dnl { +dnl static char buf[8] = { 'D', 'E', 'A', 'D', 'B', 'E', 'E', 'F' }; +dnl my_snprintf (buf, 0, "%d", 12345); +dnl return buf[0] != 'D'; +dnl } +dnl --------------------------------------------------------------------- +dnl Result is gl_cv_func_vsnprintf_zerosize_c99. + +AC_DEFUN([gl_VSNPRINTF_ZEROSIZE_C99], +[ + AC_REQUIRE([AC_PROG_CC]) + AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles + AC_CACHE_CHECK([whether vsnprintf respects a zero size as in C99], + [gl_cv_func_vsnprintf_zerosize_c99], + [ + AC_RUN_IFELSE( + [AC_LANG_SOURCE([[ +#include <stdarg.h> +#include <stdio.h> +static int my_snprintf (char *buf, int size, const char *format, ...) +{ + va_list args; + int ret; + va_start (args, format); + ret = vsnprintf (buf, size, format, args); + va_end (args); + return ret; +} +int main() +{ + static char buf[8] = { 'D', 'E', 'A', 'D', 'B', 'E', 'E', 'F' }; + my_snprintf (buf, 0, "%d", 12345); + return buf[0] != 'D'; +}]])], + [gl_cv_func_vsnprintf_zerosize_c99=yes], + [gl_cv_func_vsnprintf_zerosize_c99=no], + [ +changequote(,)dnl + case "$host_os" in + # Guess yes on glibc systems. + *-gnu* | gnu*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";; + # Guess yes on musl systems. + *-musl* | midipix*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";; + # Guess yes on FreeBSD >= 5. + freebsd[1-4].*) gl_cv_func_vsnprintf_zerosize_c99="guessing no";; + freebsd* | kfreebsd*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";; + midnightbsd*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";; + # Guess yes on Mac OS X >= 10.3. + darwin[1-6].*) gl_cv_func_vsnprintf_zerosize_c99="guessing no";; + darwin*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";; + # Guess yes on Cygwin. + cygwin*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";; + # Guess yes on Solaris >= 2.6. + solaris2.[0-5] | solaris2.[0-5].*) + gl_cv_func_vsnprintf_zerosize_c99="guessing no";; + solaris*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";; + # Guess yes on AIX >= 4. + aix[1-3]*) gl_cv_func_vsnprintf_zerosize_c99="guessing no";; + aix*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";; + # Guess yes on IRIX >= 6.5. + irix6.5) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";; + # Guess yes on NetBSD >= 3. + netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*) + gl_cv_func_vsnprintf_zerosize_c99="guessing no";; + netbsd*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";; + # Guess yes on BeOS. + beos*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";; + # Guess yes on Android. + linux*-android*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";; + # Guess yes on native Windows. + mingw* | pw*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";; + # If we don't know, obey --enable-cross-guesses. + *) gl_cv_func_vsnprintf_zerosize_c99="$gl_cross_guess_normal";; + esac +changequote([,])dnl + ]) + ]) +]) + +dnl Test whether the swprintf function works correctly when it produces output +dnl that contains null wide characters. +dnl Result is gl_cv_func_swprintf_works. + +AC_DEFUN([gl_SWPRINTF_WORKS], +[ + AC_REQUIRE([AC_PROG_CC]) + AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles + AC_CHECK_FUNCS_ONCE([swprintf]) + AC_CACHE_CHECK([whether swprintf works], + [gl_cv_func_swprintf_works], + [ + AC_RUN_IFELSE( + [AC_LANG_SOURCE([[ +#ifndef __USE_MINGW_ANSI_STDIO +# define __USE_MINGW_ANSI_STDIO 1 +#endif +#include <stdio.h> +#include <wchar.h> +int main() +{ + int result = 0; + { /* This test fails on musl libc 1.2.3, FreeBSD, NetBSD, OpenBSD, macOS, AIX. */ + wchar_t buf[5] = { 0xBEEF, 0xBEEF, 0xBEEF, 0xBEEF, 0xBEEF }; + int ret = swprintf (buf, 4, L"%cz", '\0'); + /* Expected result: + ret = 2, buf[0] = 0x0, buf[1] = 0x7a, buf[2] = 0x0, buf[3] = 0xbeef + musl libc 1.2.3: + ret = 2, buf[0] = 0x0, buf[1] = 0x0, buf[2] = 0x0, buf[3] = 0x0 + Reported at <https://www.openwall.com/lists/musl/2023/03/22/9>. + FreeBSD 13.1, NetBSD 9.0, OpenBSD 7.2, macOS 12.5, AIX 7.2: + ret = 2, buf[0] = 0x0, buf[1] = 0xbeef, buf[2] = 0xbeef, buf[3] = 0xbeef + */ + if (ret < 0 || buf[1] != 'z') + result |= 1; + } + { /* This test fails on mingw. */ + wchar_t buf[2]; + int ret = swprintf (buf, 2, L"%lc", (wint_t)0); + /* Expected: ret = 1 + mingw: ret = 0 + */ + if (ret != 1) + result |= 2; + } + return result; +}]])], + [gl_cv_func_swprintf_works=yes], + [gl_cv_func_swprintf_works=no], + [case "$host_os" in + # Guess yes on glibc systems. + *-gnu* | gnu*) gl_cv_func_swprintf_works="guessing yes";; + # Guess no on musl systems. + *-musl* | midipix*) gl_cv_func_swprintf_works="guessing no";; + # Guess no on FreeBSD, NetBSD, OpenBSD, macOS, AIX. + freebsd* | midnightbsd* | netbsd* | openbsd* | darwin* | aix*) + gl_cv_func_swprintf_works="guessing no";; + # Guess no on native Windows. + mingw* | pw*) gl_cv_func_swprintf_works="guessing no";; + # If we don't know, obey --enable-cross-guesses. + *) gl_cv_func_swprintf_works="$gl_cross_guess_normal";; + esac + ]) + ]) +]) + +dnl Test whether the *wprintf family of functions supports the 'a' and 'A' +dnl conversion specifier for hexadecimal output of 'long double' numbers. +dnl (ISO C99, POSIX:2001) +dnl Result is gl_cv_func_swprintf_directive_la. + +AC_DEFUN([gl_SWPRINTF_DIRECTIVE_LA], +[ + AC_REQUIRE([AC_PROG_CC]) + AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles + AC_CACHE_CHECK([whether swprintf supports the 'La' and 'LA' directives], + [gl_cv_func_swprintf_directive_la], + [ + AC_RUN_IFELSE( + [AC_LANG_SOURCE([[ +#include <stdio.h> +#include <wchar.h> +static wchar_t buf[100]; +int main () +{ + int result = 0; + /* This catches a glibc 2.15 and Haiku 2022 bug. */ + if (swprintf (buf, sizeof (buf) / sizeof (wchar_t), + L"%La %d", 3.1416015625L, 33, 44, 55) < 0 + || (wcscmp (buf, L"0x1.922p+1 33") != 0 + && wcscmp (buf, L"0x3.244p+0 33") != 0 + && wcscmp (buf, L"0x6.488p-1 33") != 0 + && wcscmp (buf, L"0xc.91p-2 33") != 0)) + result |= 1; + return result; +}]])], + [gl_cv_func_swprintf_directive_la=yes], + [gl_cv_func_swprintf_directive_la=no], + [case "$host_os" in + # Guess yes on glibc >= 2.17 systems. + *-gnu* | gnu*) + AC_EGREP_CPP([Unlucky], [ + #include <features.h> + #ifdef __GNU_LIBRARY__ + #if ((__GLIBC__ == 2 && __GLIBC_MINOR__ >= 16) || (__GLIBC__ > 2)) && !defined __UCLIBC__ + Unlucky + #endif + #endif + ], + [gl_cv_func_swprintf_directive_la="guessing yes"], + [gl_cv_func_swprintf_directive_la="guessing no"]) + ;; + # Guess yes on musl systems. + *-musl* | midipix*) gl_cv_func_swprintf_directive_la="guessing yes";; + # Guess yes on Android. + linux*-android*) gl_cv_func_swprintf_directive_la="guessing yes";; + # Guess no on native Windows. + mingw*) gl_cv_func_swprintf_directive_la="guessing no";; + # If we don't know, obey --enable-cross-guesses. + *) gl_cv_func_swprintf_directive_la="$gl_cross_guess_normal";; + esac + ]) + ]) +]) + +dnl Test whether the *wprintf family of functions supports the 'lc' conversion +dnl specifier for all wide characters. +dnl (ISO C11, POSIX:2001) +dnl Result is gl_cv_func_swprintf_directive_lc. + +AC_DEFUN([gl_SWPRINTF_DIRECTIVE_LC], +[ + AC_REQUIRE([AC_PROG_CC]) + AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles + AC_CACHE_CHECK([whether swprintf supports the 'lc' directive], + [gl_cv_func_swprintf_directive_lc], + [ + AC_RUN_IFELSE( + [AC_LANG_SOURCE([[ +#include <stdio.h> +#include <wchar.h> +static wchar_t buf[100]; +static wint_t L_invalid = (wchar_t) 0x76543210; +int main () +{ + int result = 0; + /* This catches a musl libc 1.2.4, Android bug. + Reported at <https://www.openwall.com/lists/musl/2023/06/12/3>. */ + if (swprintf (buf, sizeof (buf) / sizeof (wchar_t), + L"%lc %d", L_invalid, 33, 44, 55) < 0) + result |= 1; + return result; +}]])], + [gl_cv_func_swprintf_directive_lc=yes], + [gl_cv_func_swprintf_directive_lc=no], + [case "$host_os" in + # Guess yes on glibc systems. + *-gnu* | gnu*) gl_cv_func_swprintf_directive_lc="guessing yes";; + # Guess no on musl systems. + *-musl* | midipix*) gl_cv_func_swprintf_directive_lc="guessing no";; + # Guess no on Android. + linux*-android*) gl_cv_func_swprintf_directive_lc="guessing no";; + # Guess yes on native Windows. + mingw*) gl_cv_func_swprintf_directive_lc="guessing yes";; + # If we don't know, obey --enable-cross-guesses. + *) gl_cv_func_swprintf_directive_lc="$gl_cross_guess_normal";; + esac + ]) + ]) +]) + +dnl The results of these tests on various platforms are: +dnl +dnl 1 = gl_PRINTF_SIZES_C99 +dnl 2 = gl_PRINTF_SIZES_C23 +dnl 3 = gl_PRINTF_LONG_DOUBLE +dnl 4 = gl_PRINTF_INFINITE +dnl 5 = gl_PRINTF_INFINITE_LONG_DOUBLE +dnl 6 = gl_PRINTF_DIRECTIVE_A +dnl 7 = gl_PRINTF_DIRECTIVE_B +dnl 8 = gl_PRINTF_DIRECTIVE_UPPERCASE_B +dnl 9 = gl_PRINTF_DIRECTIVE_F +dnl 10 = gl_PRINTF_DIRECTIVE_N +dnl 11 = gl_PRINTF_DIRECTIVE_LS +dnl 12 = gl_PRINTF_DIRECTIVE_LC +dnl 13 = gl_PRINTF_POSITIONS +dnl 14 = gl_PRINTF_FLAG_GROUPING +dnl 15 = gl_PRINTF_FLAG_LEFTADJUST +dnl 16 = gl_PRINTF_FLAG_ZERO +dnl 17 = gl_PRINTF_PRECISION +dnl 18 = gl_PRINTF_ENOMEM +dnl 19 = gl_SNPRINTF_PRESENCE +dnl 20 = gl_SNPRINTF_TRUNCATION_C99 +dnl 21 = gl_SNPRINTF_RETVAL_C99 +dnl 22 = gl_SNPRINTF_DIRECTIVE_N +dnl 23 = gl_SNPRINTF_SIZE1 +dnl 24 = gl_VSNPRINTF_ZEROSIZE_C99 +dnl 25 = gl_SWPRINTF_WORKS +dnl 26 = gl_SWPRINTF_DIRECTIVE_LA +dnl 27 = gl_SWPRINTF_DIRECTIVE_LC +dnl +dnl 1 = checking whether printf supports size specifiers as in C99... +dnl 2 = checking whether printf supports size specifiers as in C23... +dnl 3 = checking whether printf supports 'long double' arguments... +dnl 4 = checking whether printf supports infinite 'double' arguments... +dnl 5 = checking whether printf supports infinite 'long double' arguments... +dnl 6 = checking whether printf supports the 'a' and 'A' directives... +dnl 7 = checking whether printf supports the 'b' directive... +dnl 8 = checking whether printf supports the 'B' directive... +dnl 9 = checking whether printf supports the 'F' directive... +dnl 10 = checking whether printf supports the 'n' directive... +dnl 11 = checking whether printf supports the 'ls' directive... +dnl 12 = checking whether printf supports the 'lc' directive correctly... +dnl 13 = checking whether printf supports POSIX/XSI format strings with positions... +dnl 14 = checking whether printf supports the grouping flag... +dnl 15 = checking whether printf supports the left-adjust flag correctly... +dnl 16 = checking whether printf supports the zero flag correctly... +dnl 17 = checking whether printf supports large precisions... +dnl 18 = checking whether printf survives out-of-memory conditions... +dnl 19 = checking for snprintf... +dnl 20 = checking whether snprintf truncates the result as in C99... +dnl 21 = checking whether snprintf returns a byte count as in C99... +dnl 22 = checking whether snprintf fully supports the 'n' directive... +dnl 23 = checking whether snprintf respects a size of 1... +dnl 24 = checking whether vsnprintf respects a zero size as in C99... +dnl 25 = checking whether swprintf works... +dnl 26 = checking whether swprintf supports the 'La' and 'LA' directives... +dnl 27 = checking whether swprintf supports the 'lc' directive... +dnl +dnl . = yes, # = no. +dnl +dnl 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 +dnl musl libc 1.2.3 . # . . . . # # . . . . . . . . . . . . . . . . # . # +dnl glibc 2.35 . # . . . . . . . . . # . . . . . . . . . . . . . . . +dnl glibc 2.5 . # . . . . # # . . . # . . . . . . . . . . . . . # . +dnl glibc 2.3.6 . # . . . # # # . . . # . . . . . . . . . . . . . # . +dnl FreeBSD 13.0 . # . . . # # # . . . # . . . . . # . . . . . . # . # +dnl FreeBSD 5.4, 6.1 . # . . . # # # . . . # . . . # . # . . . . . . # ? ? +dnl Mac OS X 10.13.5 . # . . # # # # . # . # . . . . . . . . . # . . # ? ? +dnl Mac OS X 10.5.8 . # . . # # # # . . . # . . . # . . . . . . . . # ? ? +dnl Mac OS X 10.3.9 . # . . . # # # . . . # . . . # . # . . . . . . # ? ? +dnl OpenBSD 6.0, 6.7 . # . . . # # # . . . # . . . . . # . . . . . . # . # +dnl OpenBSD 3.9, 4.0 . # . # # # # # # . # # . # . # . # . . . . . . # ? ? +dnl Cygwin 1.7.0 (2009) . # . . # . # # . . ? ? . . . . . ? . . . . . . ? ? ? +dnl Cygwin 1.5.25 (2008) . # . . # # # # . . # ? . . . . . # . . . . . . ? ? ? +dnl Cygwin 1.5.19 (2006) # # . . # # # # # . # ? . # . # # # . . . . . . ? ? ? +dnl Solaris 11.4 . # . # # # # # . . # # . . . # . . . . . . . . . # . +dnl Solaris 11.3 . # . . . # # # . . # # . . . . . . . . . . . . . # . +dnl Solaris 11.0 . # . # # # # # . . # # . . . # . . . . . . . . ? ? ? +dnl Solaris 10 . # . # # # # # . . # # . . . # # . . . . . . . . # . +dnl Solaris 2.6 ... 9 # # . # # # # # # . # # . . . # # . . . # . . . ? ? ? +dnl Solaris 2.5.1 # # . # # # # # # . # # . . . # . . # # # # # # ? ? ? +dnl AIX 7.1 . # . # # # # # . . . # . . . # # . . . . . . . # . . +dnl AIX 5.2 . # . # # # # # . . . # . . . # . . . . . . . . # ? ? +dnl AIX 4.3.2, 5.1 # # . # # # # # # . . # . . . # . . . . # . . . # ? ? +dnl HP-UX 11.31 . # . . . # # # . . . ? . . . # . . . . # # . . ? ? ? +dnl HP-UX 11.{00,11,23} # # . . . # # # # . . ? . . . # . . . . # # . # ? ? ? +dnl HP-UX 10.20 # # . # . # # # # . ? ? . . # # . . . . # # ? # ? ? ? +dnl IRIX 6.5 # # . # # # # # # . # # . . . # . . . . # . . . # ? ? +dnl OSF/1 5.1 # # . # # # # # # . . ? . . . # . . . . # . . # ? ? ? +dnl OSF/1 4.0d # # . # # # # # # . . ? . . . # . . # # # # # # ? ? ? +dnl NetBSD 9.0 . # . . . # # # . . . # . . . . . . . . . . . . # . # +dnl NetBSD 5.0 . # . . # # # # . . . # . . . # . # . . . . . . # ? ? +dnl NetBSD 4.0 . # ? ? ? ? # # ? . ? # . ? ? ? ? ? . . . ? ? ? # ? ? +dnl NetBSD 3.0 . # . . . # # # # . ? # # # ? # . # . . . . . . # ? ? +dnl Haiku . # . . # # # # # . # ? . . . . . ? . . ? . . . . # . +dnl BeOS # # # . # # # # # . ? ? # . ? . # ? . . ? . . . ? ? ? +dnl Android 4.3 . # . # # # # # # # # ? . # . # . # . . . # . . ? ? ? +dnl old mingw / msvcrt # # # # # # # # # . . ? # # . # # ? . # # # . . # ? ? +dnl MSVC 9 # # # # # # # # # # . ? # # . # # ? # # # # . . # ? ? +dnl mingw 2009-2011 . # # . # . # # . . . ? # # . . . ? . . . . . . # ? ? +dnl mingw-w64 2011 # # # # # # # # # . . ? # # . # # ? . # # # . . # ? ? |