[gssapi-openssh.git] / openssh / openbsd-compat / bsd-asprintf.c

/*
 * 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 "includes.h"

#ifndef HAVE_VASPRINTF

#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
Commit	Line	Data
2c06c99b	1	/*
	2	* Copyright (c) 2004 Darren Tucker.
	3	*
	4	* Based originally on asprintf.c from OpenBSD:
	5	* Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
	6	*
	7	* Permission to use, copy, modify, and distribute this software for any
	8	* purpose with or without fee is hereby granted, provided that the above
	9	* copyright notice and this permission notice appear in all copies.
	10	*
	11	* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
	12	* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
	13	* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
	14	* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
	15	* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
	16	* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
	17	* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
	18	*/
	19
	20	#include "includes.h"
	21
	22	#ifndef HAVE_VASPRINTF
	23
	24	#ifndef VA_COPY
	25	# ifdef HAVE_VA_COPY
	26	# define VA_COPY(dest, src) va_copy(dest, src)
	27	# else
	28	# ifdef HAVE___VA_COPY
	29	# define VA_COPY(dest, src) __va_copy(dest, src)
	30	# else
	31	# define VA_COPY(dest, src) (dest) = (src)
	32	# endif
	33	# endif
	34	#endif
	35
	36	#define INIT_SZ 128
	37
	38	int vasprintf(char *str, const char fmt, va_list ap)
	39	{
	40	int ret = -1;
	41	va_list ap2;
	42	char string, newstr;
	43	size_t len;
	44
	45	VA_COPY(ap2, ap);
	46	if ((string = malloc(INIT_SZ)) == NULL)
	47	goto fail;
	48
	49	ret = vsnprintf(string, INIT_SZ, fmt, ap2);
	50	if (ret >= 0 && ret < INIT_SZ) { /* succeeded with initial alloc */
	51	*str = string;
	52	} else if (ret == INT_MAX) { /* shouldn't happen */
	53	goto fail;
	54	} else { /* bigger than initial, realloc allowing for nul */
	55	len = (size_t)ret + 1;
	56	if ((newstr = realloc(string, len)) == NULL) {
	57	free(string);
	58	goto fail;
	59	} else {
	60	va_end(ap2);
	61	VA_COPY(ap2, ap);
	62	ret = vsnprintf(newstr, len, fmt, ap2);
	63	if (ret >= 0 && (size_t)ret < len) {
	64	*str = newstr;
65	} else { /* failed with realloc'ed string, give up */
66	free(newstr);
67	goto fail;
68	}
69	}
70	}
71	va_end(ap2);
72	return (ret);
73
74	fail:
75	*str = NULL;
76	errno = ENOMEM;
77	va_end(ap2);
78	return (-1);
79	}
80	#endif
81
82	#ifndef HAVE_ASPRINTF
83	int asprintf(char *str, const char fmt, ...)
84	{
85	va_list ap;
86	int ret;
87
88	*str = NULL;
89	va_start(ap, fmt);
90	ret = vasprintf(str, fmt, ap);
91	va_end(ap);
92
93	return ret;
94	}
95	#endif