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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 11:11:40 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 11:11:40 +0000 |
commit | 7731832751ab9f3c6ddeb66f186d3d7fa1934a6d (patch) | |
tree | e91015872543a59be2aad26c2fea02e41b57005d /libraries/liblber/stdio.c | |
parent | Initial commit. (diff) | |
download | openldap-upstream/2.4.57+dfsg.tar.xz openldap-upstream/2.4.57+dfsg.zip |
Adding upstream version 2.4.57+dfsg.upstream/2.4.57+dfsgupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | libraries/liblber/stdio.c | 243 |
1 files changed, 243 insertions, 0 deletions
diff --git a/libraries/liblber/stdio.c b/libraries/liblber/stdio.c new file mode 100644 index 0000000..064096b --- /dev/null +++ b/libraries/liblber/stdio.c @@ -0,0 +1,243 @@ +/* $OpenLDAP$ */ +/* This work is part of OpenLDAP Software <http://www.openldap.org/>. + * + * Copyright 1998-2021 The OpenLDAP Foundation. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted only as authorized by the OpenLDAP + * Public License. + * + * A copy of this license is available in the file LICENSE in the + * top-level directory of the distribution or, alternatively, at + * <http://www.OpenLDAP.org/license.html>. + */ + +#include "portable.h" + +#include <stdio.h> +#include <ac/stdarg.h> +#include <ac/string.h> +#include <ac/ctype.h> +#include <lutil.h> + +#if !defined(HAVE_VSNPRINTF) && !defined(HAVE_EBCDIC) +/* Write at most n characters to the buffer in str, return the + * number of chars written or -1 if the buffer would have been + * overflowed. + * + * This is portable to any POSIX-compliant system. We use pipe() + * to create a valid file descriptor, and then fdopen() it to get + * a valid FILE pointer. The user's buffer and size are assigned + * to the FILE pointer using setvbuf. Then we close the read side + * of the pipe to invalidate the descriptor. + * + * If the write arguments all fit into size n, the write will + * return successfully. If the write is too large, the stdio + * buffer will need to be flushed to the underlying file descriptor. + * The flush will fail because it is attempting to write to a + * broken pipe, and the write will be terminated. + * -- hyc, 2002-07-19 + */ +/* This emulation uses vfprintf; on OS/390 we're also emulating + * that function so it's more efficient just to have a separate + * version of vsnprintf there. + */ +#include <ac/signal.h> +int ber_pvt_vsnprintf( char *str, size_t n, const char *fmt, va_list ap ) +{ + int fds[2], res; + FILE *f; + RETSIGTYPE (*sig)(); + + if (pipe( fds )) return -1; + + f = fdopen( fds[1], "w" ); + if ( !f ) { + close( fds[1] ); + close( fds[0] ); + return -1; + } + setvbuf( f, str, _IOFBF, n ); + sig = signal( SIGPIPE, SIG_IGN ); + close( fds[0] ); + + res = vfprintf( f, fmt, ap ); + + fclose( f ); + signal( SIGPIPE, sig ); + if ( res > 0 && res < n ) { + res = vsprintf( str, fmt, ap ); + } + return res; +} +#endif + +#ifndef HAVE_SNPRINTF +int ber_pvt_snprintf( char *str, size_t n, const char *fmt, ... ) +{ + va_list ap; + int res; + + va_start( ap, fmt ); + res = vsnprintf( str, n, fmt, ap ); + va_end( ap ); + return res; +} +#endif /* !HAVE_SNPRINTF */ + +#ifdef HAVE_EBCDIC +/* stdio replacements with ASCII/EBCDIC translation for OS/390. + * The OS/390 port depends on the CONVLIT compiler option being + * used to force character and string literals to be compiled in + * ISO8859-1, and the __LIBASCII cpp symbol to be defined to use the + * OS/390 ASCII-compatibility library. This library only supplies + * an ASCII version of sprintf, so other needed functions are + * provided here. + * + * All of the internal character manipulation is done in ASCII, + * but file I/O is EBCDIC, so we catch any stdio reading/writing + * of files here and do the translations. + */ + +#undef fputs +#undef fgets + +char *ber_pvt_fgets( char *s, int n, FILE *fp ) +{ + s = (char *)fgets( s, n, fp ); + if ( s ) __etoa( s ); + return s; +} + +int ber_pvt_fputs( const char *str, FILE *fp ) +{ + char buf[8192]; + + strncpy( buf, str, sizeof(buf) ); + __atoe( buf ); + return fputs( buf, fp ); +} + +/* The __LIBASCII doesn't include a working vsprintf, so we make do + * using just sprintf. This is a very simplistic parser that looks for + * format strings and uses sprintf to process them one at a time. + * Literal text is just copied straight to the destination. + * The result is appended to the destination string. The parser + * recognizes field-width specifiers and the 'l' qualifier; it + * may need to be extended to recognize other qualifiers but so + * far this seems to be enough. + */ +int ber_pvt_vsnprintf( char *str, size_t n, const char *fmt, va_list ap ) +{ + char *ptr, *pct, *s2, *f2, *end; + char fm2[64]; + int len, rem; + + ptr = (char *)fmt; + s2 = str; + fm2[0] = '%'; + if (n) { + end = str + n; + } else { + end = NULL; + } + + for (pct = strchr(ptr, '%'); pct; pct = strchr(ptr, '%')) { + len = pct-ptr; + if (end) { + rem = end-s2; + if (rem < 1) return -1; + if (rem < len) len = rem; + } + s2 = lutil_strncopy( s2, ptr, len ); + /* Did we cheat the length above? If so, bail out */ + if (len < pct-ptr) return -1; + for (pct++, f2 = fm2+1; isdigit(*pct);) *f2++ = *pct++; + if (*pct == 'l') *f2++ = *pct++; + if (*pct == '%') { + *s2++ = '%'; + } else { + *f2++ = *pct; + *f2 = '\0'; + if (*pct == 's') { + char *ss = va_arg(ap, char *); + /* Attempt to limit sprintf output. This + * may be thrown off if field widths were + * specified for this string. + * + * If it looks like the string is too + * long for the remaining buffer, bypass + * sprintf and just copy what fits, then + * quit. + */ + if (end && strlen(ss) > (rem=end-s2)) { + strncpy(s2, ss, rem); + return -1; + } else { + s2 += sprintf(s2, fm2, ss); + } + } else { + s2 += sprintf(s2, fm2, va_arg(ap, int)); + } + } + ptr = pct + 1; + } + if (end) { + rem = end-s2; + if (rem > 0) { + len = strlen(ptr); + s2 = lutil_strncopy( s2, ptr, rem ); + rem -= len; + } + if (rem < 0) return -1; + } else { + s2 = lutil_strcopy( s2, ptr ); + } + return s2 - str; +} + +int ber_pvt_vsprintf( char *str, const char *fmt, va_list ap ) +{ + return vsnprintf( str, 0, fmt, ap ); +} + +/* The fixed buffer size here is a problem, we don't know how + * to flush the buffer and keep printing if the msg is too big. + * Hopefully we never try to write something bigger than this + * in a log msg... + */ +int ber_pvt_vfprintf( FILE *fp, const char *fmt, va_list ap ) +{ + char buf[8192]; + int res; + + vsnprintf( buf, sizeof(buf), fmt, ap ); + __atoe( buf ); + res = fputs( buf, fp ); + if (res == EOF) res = -1; + return res; +} + +int ber_pvt_printf( const char *fmt, ... ) +{ + va_list ap; + int res; + + va_start( ap, fmt ); + res = ber_pvt_vfprintf( stdout, fmt, ap ); + va_end( ap ); + return res; +} + +int ber_pvt_fprintf( FILE *fp, const char *fmt, ... ) +{ + va_list ap; + int res; + + va_start( ap, fmt ); + res = ber_pvt_vfprintf( fp, fmt, ap ); + va_end( ap ); + return res; +} +#endif |