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102 lines
2.3 KiB
C
102 lines
2.3 KiB
C
/*
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* Copyright (c) 2004 Darren Tucker.
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*
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* Based originally on asprintf.c from OpenBSD:
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* Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "includes.h"
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#ifndef HAVE_VASPRINTF
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#include <errno.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#ifndef VA_COPY
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# ifdef HAVE_VA_COPY
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# define VA_COPY(dest, src) va_copy(dest, src)
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# else
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# ifdef HAVE___VA_COPY
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# define VA_COPY(dest, src) __va_copy(dest, src)
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# else
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# define VA_COPY(dest, src) (dest) = (src)
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# endif
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# endif
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#endif
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#define INIT_SZ 128
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int
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vasprintf(char **str, const char *fmt, va_list ap)
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{
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int ret = -1;
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va_list ap2;
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char *string, *newstr;
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size_t len;
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VA_COPY(ap2, ap);
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if ((string = malloc(INIT_SZ)) == NULL)
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goto fail;
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ret = vsnprintf(string, INIT_SZ, fmt, ap2);
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if (ret >= 0 && ret < INIT_SZ) { /* succeeded with initial alloc */
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*str = string;
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} else if (ret == INT_MAX || ret < 0) { /* Bad length */
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free(string);
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goto fail;
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} else { /* bigger than initial, realloc allowing for nul */
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len = (size_t)ret + 1;
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if ((newstr = realloc(string, len)) == NULL) {
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free(string);
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goto fail;
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} else {
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va_end(ap2);
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VA_COPY(ap2, ap);
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ret = vsnprintf(newstr, len, fmt, ap2);
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if (ret >= 0 && (size_t)ret < len) {
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*str = newstr;
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} else { /* failed with realloc'ed string, give up */
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free(newstr);
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goto fail;
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}
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}
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}
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va_end(ap2);
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return (ret);
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fail:
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*str = NULL;
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errno = ENOMEM;
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va_end(ap2);
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return (-1);
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}
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#endif
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#ifndef HAVE_ASPRINTF
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int asprintf(char **str, const char *fmt, ...)
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{
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va_list ap;
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int ret;
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*str = NULL;
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va_start(ap, fmt);
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ret = vasprintf(str, fmt, ap);
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va_end(ap);
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return ret;
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}
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#endif
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