1 /* $NetBSD: str.c,v 1.7 2009/10/21 01:07:47 snj Exp $ */ 2 3 /* 4 * Copyright (c) 1994 Christos Zoulas 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 17 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY 20 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 #ifndef lint 31 __RCSID("$NetBSD: str.c,v 1.7 2009/10/21 01:07:47 snj Exp $"); 32 #endif 33 34 /* 35 * Counted strings 36 */ 37 #include <stdlib.h> 38 #include <string.h> 39 #include <err.h> 40 #include <util.h> 41 42 #include "str.h" 43 44 /* 45 * str_init(): Initialize string 46 */ 47 void 48 str_init(struct string *s) 49 { 50 s->s_str = NULL; 51 s->s_len = 0; 52 } 53 54 55 /* 56 * str_append(): Append string allocating buffer as necessary 57 */ 58 void 59 str_append(struct string *buf, const char *str, int del) 60 { 61 size_t len = strlen(str) + 1; 62 63 if (buf->s_str == NULL) 64 buf->s_str = emalloc(len); 65 else { 66 buf->s_str = erealloc(buf->s_str, buf->s_len + len + 67 (del ? 2 : 1)); 68 if (del) 69 buf->s_str[buf->s_len++] = del; 70 } 71 72 memcpy(&buf->s_str[buf->s_len], str, len); 73 buf->s_len += len - 1; 74 } 75 76 /* 77 * str_prepend(): Prepend string allocating buffer as necessary 78 */ 79 void 80 str_prepend(struct string *buf, const char *str, int del) 81 { 82 char *ptr, *sptr; 83 size_t len = strlen(str) + 1; 84 85 sptr = ptr = emalloc(buf->s_len + len + (del ? 2 : 1)); 86 87 if (del) 88 *ptr++ = del; 89 90 memcpy(ptr, str, len); 91 92 if (buf->s_str) { 93 memcpy(&ptr[len - 1], buf->s_str, buf->s_len + 1); 94 free(buf->s_str); 95 } 96 97 buf->s_str = sptr; 98 buf->s_len += del ? len : len - 1; 99 } 100 101 /* 102 * str_free(): Free a string 103 */ 104 void 105 str_free(struct string *s) 106 { 107 free(s->s_str); 108 s->s_str = NULL; 109 s->s_len = 0; 110 } 111