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Octocat-spinner-32-eaf2f5

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/*
* Copyright (c) 2004 Darren Tucker.
*
* Based originally on asprintf.c from OpenBSD:
* Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/

#include <config.h>

#ifndef HAVE_VASPRINTF

#include <errno.h>
#include <stdarg.h>
#include <stdlib.h>

#ifndef VA_COPY
# ifdef HAVE_VA_COPY
# define VA_COPY(dest, src) va_copy(dest, src)
# else
# ifdef HAVE___VA_COPY
# define VA_COPY(dest, src) __va_copy(dest, src)
# else
# define VA_COPY(dest, src) (dest) = (src)
# endif
# endif
#endif

#define INIT_SZ 128

int vasprintf(char **str, const char *fmt, va_list ap)
{
int ret = -1;
va_list ap2;
char *string, *newstr;
size_t len;

VA_COPY(ap2, ap);
if ((string = malloc(INIT_SZ)) == NULL)
goto fail;

ret = vsnprintf(string, INIT_SZ, fmt, ap2);
if (ret >= 0 && ret < INIT_SZ) { /* succeeded with initial alloc */
*str = string;
} else if (ret == INT_MAX) { /* shouldn't happen */
goto fail;
} else { /* bigger than initial, realloc allowing for nul */
len = (size_t)ret + 1;
if ((newstr = realloc(string, len)) == NULL) {
free(string);
goto fail;
} else {
va_end(ap2);
VA_COPY(ap2, ap);
ret = vsnprintf(newstr, len, fmt, ap2);
if (ret >= 0 && (size_t)ret < len) {
*str = newstr;
} else { /* failed with realloc'ed string, give up */
free(newstr);
goto fail;
}
}
}
va_end(ap2);
return (ret);

fail:
*str = NULL;
errno = ENOMEM;
va_end(ap2);
return (-1);
}
#endif

#ifndef HAVE_ASPRINTF
int asprintf(char **str, const char *fmt, ...)
{
va_list ap;
int ret;

*str = NULL;
va_start(ap, fmt);
ret = vasprintf(str, fmt, ap);
va_end(ap);

return ret;
}
#endif
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