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