| 1 | /* strbuf - String buffer routines |
| 2 | * |
| 3 | * Copyright (c) 2010-2011 Mark Pulford <mark@kyne.com.au> |
| 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 | */ |