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Reactos
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108/* Copyright (c) 2004 Darren Tucker. * * Based originally on asprintf.c from OpenBSD: * Copyright (c) 1997 Todd C. Miller <Todd.Miller AT 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. */
//extern int vsnprintf();#include <wintirpc.h>#include <stdio.h>#ifndef __REACTOS__#include <varargs.h>#endif
/* Include vasprintf() if not on your OS. */#ifndef HAVE_VASPRINTF
#include <errno.h>#include <limits.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
intvasprintf(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 || ret < 0) { /* Bad length */ 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
/* Include asprintf() if not on your OS. */#ifndef HAVE_ASPRINTFint 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