117 lines
3.4 KiB
C
117 lines
3.4 KiB
C
/*
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* $Source$
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* $Revision$
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* $Date$
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*
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* Copyright (c) 1996-99 by Peter Simons <simons@cys.de>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Peter Simons.
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*
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdarg.h>
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#include <string.h>
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#include "text.h"
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#if !defined(HAVE_VSNPRINTF) && defined(HAVE___VSNPRINTF)
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# define vsnprintf __vsnprintf
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#endif
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/* Use sprintf() without worrying about buffer size.
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One problem when dealing a lot with texts and strings is the buffer
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handling. Usually a programmer will frequently have to format
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several strings into a new one using sprintf(3), without knowing
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how long the resulting string will become.
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text_easy_sprintf() will solve this problem. The syntax is very much
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like sprintf(), except for that the target buffer is allocated by
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the routine and returned to the caller.
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RETURNS: A buffer holding the formatted string or NULL if the
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memory allocation failed.
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NOTE: The returned buffer has been allocated with malloc(3) and
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should be freed when not needed anymore.
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AUTHOR: Peter Simons <simons@rhein.de>
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*/
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char *
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text_easy_sprintf(const char * fmt /* Format string in printf(3) syntax. */,
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... /* Parameter list. */)
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{
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char * buffer,
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* result;
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size_t buffer_size;
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va_list ap;
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int rc;
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/* Sanity checks. */
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assert(fmt != NULL);
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if (fmt == NULL)
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return NULL;
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/* Do the work. */
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va_start(ap, fmt);
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for (buffer_size = 0, result = NULL; TRUE; free(buffer)) { /* forever */
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/* Allocate the internal buffer. */
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buffer_size += 8 * 1024;
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buffer = malloc(buffer_size);
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if (buffer == NULL)
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goto leave;
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/* Format the string into it. */
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rc = vsnprintf(buffer, buffer_size, fmt, ap);
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/* Success? */
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if (rc < buffer_size) {
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/* Yes. */
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result = strdup(buffer);
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free(buffer);
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goto leave;
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}
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/* No. */
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}
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leave:
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va_end(ap);
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return result;
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}
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