1 /* $NetBSD: str.c,v 1.4 1997/10/17 11:49:10 lukem 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 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by Christos Zoulas. 18 * 4. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 22 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 23 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY 25 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 #ifndef lint 36 __RCSID("$NetBSD: str.c,v 1.4 1997/10/17 11:49:10 lukem Exp $"); 37 #endif 38 39 /* 40 * Counted strings 41 */ 42 #include <stdlib.h> 43 #include <string.h> 44 45 #include "util.h" 46 #include "str.h" 47 48 /* 49 * str_init(): Initialize string 50 */ 51 void 52 str_init(s) 53 struct string *s; 54 { 55 s->s_str = NULL; 56 s->s_len = 0; 57 } 58 59 60 /* 61 * str_append(): Append string allocating buffer as necessary 62 */ 63 void 64 str_append(buf, str, del) 65 struct string *buf; 66 const char *str; 67 int del; 68 { 69 size_t len = strlen(str) + 1; 70 71 if (buf->s_str == NULL) 72 buf->s_str = emalloc(len); 73 else { 74 buf->s_str = erealloc(buf->s_str, buf->s_len + len + 75 (del ? 2 : 1)); 76 if (del) 77 buf->s_str[buf->s_len++] = del; 78 } 79 80 memcpy(&buf->s_str[buf->s_len], str, len); 81 buf->s_len += len - 1; 82 } 83 84 /* 85 * str_prepend(): Prepend string allocating buffer as necessary 86 */ 87 void 88 str_prepend(buf, str, del) 89 struct string *buf; 90 const char *str; 91 int del; 92 { 93 char *ptr, *sptr; 94 size_t len = strlen(str) + 1; 95 96 sptr = ptr = emalloc(buf->s_len + len + (del ? 2 : 1)); 97 98 if (del) 99 *ptr++ = del; 100 101 memcpy(ptr, str, len); 102 103 if (buf->s_str) { 104 memcpy(&ptr[len - 1], buf->s_str, buf->s_len + 1); 105 free(buf->s_str); 106 } 107 108 buf->s_str = sptr; 109 buf->s_len += del ? len : len - 1; 110 } 111 112 /* 113 * str_free(): Free a string 114 */ 115 void 116 str_free(s) 117 struct string *s; 118 { 119 free(s->s_str); 120 s->s_str = NULL; 121 s->s_len = 0; 122 } 123