1 /* strbuf - String buffer routines 2 * 3 * Copyright (c) 2010-2011 Mark Pulford <[email protected]> 4 * 5 * Permission is hereby granted, free of charge, to any person obtaining 6 * a copy of this software and associated documentation files (the 7 * "Software"), to deal in the Software without restriction, including 8 * without limitation the rights to use, copy, modify, merge, publish, 9 * distribute, sublicense, and/or sell copies of the Software, and to 10 * permit persons to whom the Software is furnished to do so, subject to 11 * the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be 14 * included in all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 17 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 19 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY 20 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, 21 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE 22 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 23 */ 24 25 #include <stdlib.h> 26 #include <stdarg.h> 27 28 /* Size: Total bytes allocated to *buf 29 * Length: String length, excluding optional NULL terminator. 30 * Increment: Allocation increments when resizing the string buffer. 31 * Dynamic: True if created via strbuf_new() 32 */ 33 34 typedef struct { 35 char *buf; 36 int size; 37 int length; 38 int increment; 39 int dynamic; 40 int reallocs; 41 int debug; 42 } strbuf_t; 43 44 #ifndef STRBUF_DEFAULT_SIZE 45 #define STRBUF_DEFAULT_SIZE 1023 46 #endif 47 #ifndef STRBUF_DEFAULT_INCREMENT 48 #define STRBUF_DEFAULT_INCREMENT -2 49 #endif 50 51 /* Initialise */ 52 extern strbuf_t *strbuf_new(int len); 53 extern void strbuf_init(strbuf_t *s, int len); 54 extern void strbuf_set_increment(strbuf_t *s, int increment); 55 56 /* Release */ 57 extern void strbuf_free(strbuf_t *s); 58 extern char *strbuf_free_to_string(strbuf_t *s, int *len); 59 60 /* Management */ 61 extern void strbuf_resize(strbuf_t *s, int len); 62 static int strbuf_empty_length(strbuf_t *s); 63 static int strbuf_length(strbuf_t *s); 64 static char *strbuf_string(strbuf_t *s, int *len); 65 static void strbuf_ensure_empty_length(strbuf_t *s, int len); 66 67 /* Update */ 68 extern void strbuf_append_fmt(strbuf_t *s, int len, const char *fmt, ...); 69 extern void strbuf_append_fmt_retry(strbuf_t *s, const char *format, ...); 70 static void strbuf_append_mem(strbuf_t *s, const char *c, int len); 71 extern void strbuf_append_string(strbuf_t *s, const char *str); 72 static void strbuf_append_char(strbuf_t *s, const char c); 73 static void strbuf_ensure_null(strbuf_t *s); 74 75 /* Reset string for before use */ 76 static inline void strbuf_reset(strbuf_t *s) 77 { 78 s->length = 0; 79 } 80 81 static inline int strbuf_allocated(strbuf_t *s) 82 { 83 return s->buf != NULL; 84 } 85 86 /* Return bytes remaining in the string buffer 87 * Ensure there is space for a NULL terminator. */ 88 static inline int strbuf_empty_length(strbuf_t *s) 89 { 90 return s->size - s->length - 1; 91 } 92 93 static inline void strbuf_ensure_empty_length(strbuf_t *s, int len) 94 { 95 if (len > strbuf_empty_length(s)) 96 strbuf_resize(s, s->length + len); 97 } 98 99 static inline int strbuf_length(strbuf_t *s) 100 { 101 return s->length; 102 } 103 104 static inline void strbuf_append_char(strbuf_t *s, const char c) 105 { 106 strbuf_ensure_empty_length(s, 1); 107 s->buf[s->length++] = c; 108 } 109 110 static inline void strbuf_append_char_unsafe(strbuf_t *s, const char c) 111 { 112 s->buf[s->length++] = c; 113 } 114 115 static inline void strbuf_append_mem(strbuf_t *s, const char *c, int len) 116 { 117 strbuf_ensure_empty_length(s, len); 118 memcpy(s->buf + s->length, c, len); 119 s->length += len; 120 } 121 122 static inline void strbuf_append_mem_unsafe(strbuf_t *s, const char *c, int len) 123 { 124 memcpy(s->buf + s->length, c, len); 125 s->length += len; 126 } 127 128 static inline void strbuf_ensure_null(strbuf_t *s) 129 { 130 s->buf[s->length] = 0; 131 } 132 133 static inline char *strbuf_string(strbuf_t *s, int *len) 134 { 135 if (len) 136 *len = s->length; 137 138 return s->buf; 139 } 140 141 /* vi:ai et sw=4 ts=4: 142 */ 143