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author | Kaveh R. Ghazi <ghazi@caip.rutgers.edu> | 2003-04-16 22:42:07 +0000 |
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committer | Kaveh Ghazi <ghazi@gcc.gnu.org> | 2003-04-16 22:42:07 +0000 |
commit | bd3fbc6b72cfc51aa7711fa8730f41fa132ef49d (patch) | |
tree | a91d9da975d02c016d6460be9efcd61e15f9b104 /libiberty/vsnprintf.c | |
parent | a9ecacf6c44316e20d54c36f84ae80dedfff09e6 (diff) | |
download | gcc-bd3fbc6b72cfc51aa7711fa8730f41fa132ef49d.zip gcc-bd3fbc6b72cfc51aa7711fa8730f41fa132ef49d.tar.gz gcc-bd3fbc6b72cfc51aa7711fa8730f41fa132ef49d.tar.bz2 |
configure.in (funcs, [...]): Add snprintf and vsnprintf.
* configure.in (funcs, AC_CHECK_FUNCS): Add snprintf and
vsnprintf.
* snprintf.c, vsnprintf.c: New files.
* Makefile.in (CFILES): Add snprintf.c and vsnprintf.c.
(CONFIGURED_OFILES): Add snprintf.o and vsnprintf.o.
Regenerate dependencies.
* functions.texi, configure, config.in: Regenerated.
From-SVN: r65704
Diffstat (limited to 'libiberty/vsnprintf.c')
-rw-r--r-- | libiberty/vsnprintf.c | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/libiberty/vsnprintf.c b/libiberty/vsnprintf.c new file mode 100644 index 0000000..9328e43 --- /dev/null +++ b/libiberty/vsnprintf.c @@ -0,0 +1,149 @@ +/* Implement the vsnprintf function. + Copyright (C) 2003 Free Software Foundation, Inc. + Written by Kaveh R. Ghazi <ghazi@caip.rutgers.edu>. + +This file is part of the libiberty library. This library 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 2, or (at your option) +any later version. + +This library 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 GNU CC; see the file COPYING. If not, write to +the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + +As a special exception, if you link this library with files +compiled with a GNU compiler to produce an executable, this does not cause +the resulting executable to be covered by the GNU General Public License. +This exception does not however invalidate any other reasons why +the executable file might be covered by the GNU General Public License. */ + +/* + +@deftypefn Supplemental int vsnprintf (char *@var{buf}, size_t @var{n}, const char *@var{format}, va_list @var{ap}) + +This function is similar to vsprintf, but it will print at most +@var{n} characters. On error the return value is -1, otherwise it +returns the number of characters that would have been printed had +@var{n} been sufficiently large, regardless of the actual value of +@var{n}. Note some pre-C99 system libraries do not implement this +correctly so users cannot generally rely on the return value if the +system version of this function is used. + +@end deftypefn + +*/ + +#include "config.h" +#include "ansidecl.h" + +#ifdef ANSI_PROTOTYPES +#include <stdarg.h> +#else +#include <varargs.h> +#endif +#ifdef HAVE_STRING_H +#include <string.h> +#endif +#ifdef HAVE_STDLIB_H +#include <stdlib.h> +#endif + +#include "libiberty.h" + +/* This implementation relies on a working vasprintf. */ +int +vsnprintf (s, n, format, ap) + char * s; + size_t n; + const char *format; + va_list ap; +{ + char *buf = 0; + int result = vasprintf (&buf, format, ap); + + if (!buf) + return -1; + if (result < 0) + { + free (buf); + return -1; + } + + result = strlen (buf); + if (n > 0) + { + strncpy (s, buf, n); + if (n - 1 < (size_t) result) + s[n - 1] = 0; + } + free (buf); + return result; +} + +#ifdef TEST +/* Set the buffer to a known state. */ +#define CLEAR(BUF) do { memset ((BUF), 'X', sizeof (BUF)); (BUF)[14] = '\0'; } while (0) +/* For assertions. */ +#define VERIFY(P) do { if (!(P)) abort(); } while (0) + +static int ATTRIBUTE_PRINTF_3 +checkit VPARAMS ((char *s, size_t n, const char *format, ...)) +{ + int result; + VA_OPEN (ap, format); + VA_FIXEDARG (ap, char *, s); + VA_FIXEDARG (ap, size_t, n); + VA_FIXEDARG (ap, const char *, format); + result = vsnprintf (s, n, format, ap); + VA_CLOSE (ap); + return result; +} + +extern int main PARAMS ((void)); +int +main () +{ + char buf[128]; + int status; + + CLEAR (buf); + status = checkit (buf, 10, "%s:%d", "foobar", 9); + VERIFY (status==8 && strcmp (buf, "foobar:9") == 0); + + CLEAR (buf); + status = checkit (buf, 9, "%s:%d", "foobar", 9); + VERIFY (status==8 && strcmp (buf, "foobar:9") == 0); + + CLEAR (buf); + status = checkit (buf, 8, "%s:%d", "foobar", 9); + VERIFY (status==8 && strcmp (buf, "foobar:") == 0); + + CLEAR (buf); + status = checkit (buf, 7, "%s:%d", "foobar", 9); + VERIFY (status==8 && strcmp (buf, "foobar") == 0); + + CLEAR (buf); + status = checkit (buf, 6, "%s:%d", "foobar", 9); + VERIFY (status==8 && strcmp (buf, "fooba") == 0); + + CLEAR (buf); + status = checkit (buf, 2, "%s:%d", "foobar", 9); + VERIFY (status==8 && strcmp (buf, "f") == 0); + + CLEAR (buf); + status = checkit (buf, 1, "%s:%d", "foobar", 9); + VERIFY (status==8 && strcmp (buf, "") == 0); + + CLEAR (buf); + status = checkit (buf, 0, "%s:%d", "foobar", 9); + VERIFY (status==8 && strcmp (buf, "XXXXXXXXXXXXXX") == 0); + + return 0; +} +#endif /* TEST */ |