130 lines
3.5 KiB
C
130 lines
3.5 KiB
C
/*
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* This file is part of the Sofia-SIP package
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*
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* Copyright (C) 2005 Nokia Corporation.
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*
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* Contact: Pekka Pessi <pekka.pessi@nokia.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*
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*/
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/**@ingroup su_alloc
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*
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* @CFILE su_sprintf.c su_*sprintf() functions
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*
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* @author Pekka Pessi <Pekka.Pessi@nokia.com>
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*
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* @date Created: Tue Apr 17 20:05:21 2001 ppessi
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*/
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#include "config.h"
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#include <stdlib.h>
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#include <stddef.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <string.h>
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#include <limits.h>
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#if defined(va_copy)
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/* Xyzzy */
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#elif defined(__va_copy)
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#define va_copy(dst, src) __va_copy((dst), (src))
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#else
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#define va_copy(dst, src) (memcpy(&(dst), &(src), sizeof (va_list)))
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#endif
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#include "sofia-sip/su_alloc.h"
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/**Copy a formatted string.
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*
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* The function su_vsprintf() print a string according to a @a fmt like
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* vprintf() or vsnprintf(). The resulting string is copied to a memory area
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* fresly allocated from a memory @a home. The returned string is reclaimed
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* when @a home is destroyed. It can explicitly be freed with su_free() or
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* free() if @a home is NULL.
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*
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* @param home pointer to memory home (may be NULL)
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* @param fmt format string
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* @param ap @e stdarg argument list (must match with the @a fmt format string)
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*
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* @return A pointer to a fresh copy of formatting result, or NULL upon an
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* error.
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*/
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char *su_vsprintf(su_home_t *home, char const *fmt, va_list ap)
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{
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int n;
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size_t len;
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char *rv, s[128];
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va_list aq;
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va_copy(aq, ap);
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n = vsnprintf(s, sizeof(s), fmt, aq);
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va_end(aq);
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if (n >= 0 && (size_t)n + 1 < sizeof(s))
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return su_strdup(home, s);
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len = n > 0 ? (size_t)n + 1 : 2 * sizeof(s);
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for (rv = su_alloc(home, len);
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rv;
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rv = su_realloc(home, rv, len)) {
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va_copy(aq, ap);
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n = vsnprintf(rv, len, fmt, aq);
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va_end(aq);
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if (n > -1 && (size_t)n < len)
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break;
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if (n > -1) /* glibc >2.1 */
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len = (size_t)n + 1;
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else /* glibc 2.0 */
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len *= 2;
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if (len > INT_MAX)
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return (void)su_free(home, rv), NULL;
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}
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return rv;
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}
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/**Copy a formatted string.
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*
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* The function su_sprintf() print a string according to a @a fmt like
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* printf() or snprintf(). The resulting string is copied to a memory area
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* freshly allocated from a memory @a home. The returned string is reclaimed
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* when @a home is destroyed. It can explicitly be freed with su_free() or
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* free() if @a home is NULL.
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*
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* @param home pointer to memory home (may be NULL)
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* @param fmt format string
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* @param ... argument list (must match with the @a fmt format string)
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*
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* @return A pointer to a fresh copy of formatting result, or NULL upon an
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* error.
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*/
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char *su_sprintf(su_home_t *home, char const *fmt, ...)
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{
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va_list ap;
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char *rv;
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va_start(ap, fmt);
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rv = su_vsprintf(home, fmt, ap);
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va_end(ap);
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return rv;
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}
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