/* * Copyright (c) 2000-2001 Sendmail, Inc. and its suppliers. * All rights reserved. * * By using this file, you agree to the terms and conditions set * forth in the LICENSE file which can be found at the top level of * the sendmail distribution. */ /* * Copyright (c) 1997 Todd C. Miller * * 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 TODD C. MILLER DISCLAIMS ALL * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL TODD C. MILLER 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. */ #pragma ident "%Z%%M% %I% %E% SMI" #include SM_RCSID("@(#)$Id: vasprintf.c,v 1.26.2.1 2003/06/03 02:14:09 ca Exp $") #include #include #include #include #include "local.h" /* ** SM_VASPRINTF -- printf to a dynamically allocated string ** ** Write 'printf' output to a dynamically allocated string ** buffer which is returned to the caller. ** ** Parameters: ** str -- *str receives a pointer to the allocated string ** fmt -- format directives for printing ** ap -- variable argument list ** ** Results: ** On failure, set *str to NULL, set errno, and return -1. ** ** On success, set *str to a pointer to a nul-terminated ** string buffer containing printf output, and return the ** length of the string (not counting the nul). */ #define SM_VA_BUFSIZE 128 int sm_vasprintf(str, fmt, ap) char **str; const char *fmt; SM_VA_LOCAL_DECL { int ret; SM_FILE_T fake; unsigned char *base; fake.sm_magic = SmFileMagic; fake.f_timeout = SM_TIME_FOREVER; fake.f_timeoutstate = SM_TIME_BLOCK; fake.f_file = -1; fake.f_flags = SMWR | SMSTR | SMALC; fake.f_bf.smb_base = fake.f_p = (unsigned char *)sm_malloc(SM_VA_BUFSIZE); if (fake.f_bf.smb_base == NULL) goto err2; fake.f_close = NULL; fake.f_open = NULL; fake.f_read = NULL; fake.f_write = NULL; fake.f_seek = NULL; fake.f_setinfo = fake.f_getinfo = NULL; fake.f_type = "sm_vasprintf:fake"; fake.f_bf.smb_size = fake.f_w = SM_VA_BUFSIZE - 1; fake.f_timeout = SM_TIME_FOREVER; ret = sm_io_vfprintf(&fake, SM_TIME_FOREVER, fmt, ap); if (ret == -1) goto err; *fake.f_p = '\0'; /* use no more space than necessary */ base = (unsigned char *) sm_realloc(fake.f_bf.smb_base, ret + 1); if (base == NULL) goto err; *str = (char *)base; return ret; err: if (fake.f_bf.smb_base != NULL) { sm_free(fake.f_bf.smb_base); fake.f_bf.smb_base = NULL; } err2: *str = NULL; errno = ENOMEM; return -1; }