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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-15 19:37:10 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-15 19:37:10 +0000 |
commit | c9addba5cc770d2d231b34f6739f32c6be8690f1 (patch) | |
tree | c643da154a95a1d163137135050bb47858a1654e /gl/lib/xvasprintf.c | |
parent | Initial commit. (diff) | |
download | man-db-c9addba5cc770d2d231b34f6739f32c6be8690f1.tar.xz man-db-c9addba5cc770d2d231b34f6739f32c6be8690f1.zip |
Adding upstream version 2.12.0.upstream/2.12.0
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'gl/lib/xvasprintf.c')
-rw-r--r-- | gl/lib/xvasprintf.c | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/gl/lib/xvasprintf.c b/gl/lib/xvasprintf.c new file mode 100644 index 0000000..1cedfbf --- /dev/null +++ b/gl/lib/xvasprintf.c @@ -0,0 +1,110 @@ +/* vasprintf and asprintf with out-of-memory checking. + Copyright (C) 1999, 2002-2004, 2006-2023 Free Software Foundation, Inc. + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <https://www.gnu.org/licenses/>. */ + +#include <config.h> + +/* Specification. */ +#include "xvasprintf.h" + +#include <errno.h> +#include <limits.h> +#include <string.h> +#include <stdio.h> + +#include "xalloc.h" + +/* Checked size_t computations. */ +#include "xsize.h" + +static char * +xstrcat (size_t argcount, va_list args) +{ + char *result; + va_list ap; + size_t totalsize; + size_t i; + char *p; + + /* Determine the total size. */ + totalsize = 0; + va_copy (ap, args); + for (i = argcount; i > 0; i--) + { + const char *next = va_arg (ap, const char *); + totalsize = xsum (totalsize, strlen (next)); + } + va_end (ap); + + /* Test for overflow in the summing pass above or in (totalsize + 1) below. + Also, don't return a string longer than INT_MAX, for consistency with + vasprintf(). */ + if (totalsize == SIZE_MAX || totalsize > INT_MAX) + { + errno = EOVERFLOW; + return NULL; + } + + /* Allocate and fill the result string. */ + result = XNMALLOC (totalsize + 1, char); + p = result; + for (i = argcount; i > 0; i--) + { + const char *next = va_arg (args, const char *); + size_t len = strlen (next); + memcpy (p, next, len); + p += len; + } + *p = '\0'; + + return result; +} + +char * +xvasprintf (const char *format, va_list args) +{ + char *result; + + /* Recognize the special case format = "%s...%s". It is a frequently used + idiom for string concatenation and needs to be fast. We don't want to + have a separate function xstrcat() for this purpose. */ + { + size_t argcount = 0; + const char *f; + + for (f = format;;) + { + if (*f == '\0') + /* Recognized the special case of string concatenation. */ + return xstrcat (argcount, args); + if (*f != '%') + break; + f++; + if (*f != 's') + break; + f++; + argcount++; + } + } + + if (vasprintf (&result, format, args) < 0) + { + if (errno == ENOMEM) + xalloc_die (); + return NULL; + } + + return result; +} |