1 /* $NetBSD: str.c,v 1.3 1996/10/04 05:15:30 christos 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 #ifndef lint 35 static char *rcsid = "$NetBSD: str.c,v 1.3 1996/10/04 05:15:30 christos Exp $"; 36 #endif 37 38 /* 39 * Counted strings 40 */ 41 #include <stdlib.h> 42 #include <string.h> 43 44 #include "util.h" 45 #include "str.h" 46 47 /* 48 * str_init(): Initialize string 49 */ 50 void 51 str_init(s) 52 struct string *s; 53 { 54 s->s_str = NULL; 55 s->s_len = 0; 56 } 57 58 59 /* 60 * str_append(): Append string allocating buffer as necessary 61 */ 62 void 63 str_append(buf, str, del) 64 struct string *buf; 65 const char *str; 66 int del; 67 { 68 size_t len = strlen(str) + 1; 69 70 if (buf->s_str == NULL) 71 buf->s_str = emalloc(len); 72 else { 73 buf->s_str = erealloc(buf->s_str, buf->s_len + len + 74 (del ? 2 : 1)); 75 if (del) 76 buf->s_str[buf->s_len++] = del; 77 } 78 79 memcpy(&buf->s_str[buf->s_len], str, len); 80 buf->s_len += len - 1; 81 } 82 83 /* 84 * str_prepend(): Prepend string allocating buffer as necessary 85 */ 86 void 87 str_prepend(buf, str, del) 88 struct string *buf; 89 const char *str; 90 int del; 91 { 92 char *ptr, *sptr; 93 size_t len = strlen(str) + 1; 94 95 sptr = ptr = emalloc(buf->s_len + len + (del ? 2 : 1)); 96 97 if (del) 98 *ptr++ = del; 99 100 memcpy(ptr, str, len); 101 102 if (buf->s_str) { 103 memcpy(&ptr[len - 1], buf->s_str, buf->s_len + 1); 104 free(buf->s_str); 105 } 106 107 buf->s_str = sptr; 108 buf->s_len += del ? len : len - 1; 109 } 110 111 /* 112 * str_free(): Free a string 113 */ 114 void 115 str_free(s) 116 struct string *s; 117 { 118 free(s->s_str); 119 s->s_str = NULL; 120 s->s_len = 0; 121 } 122