| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * $Id: dstr.h,v 1.1 1998/06/17 23:44:42 mdw Exp $ |
| 4 | * |
| 5 | * Handle dynamically growing strings |
| 6 | * |
| 7 | * (c) 1998 Straylight/Edgeware |
| 8 | */ |
| 9 | |
| 10 | /*----- Licensing notice --------------------------------------------------* |
| 11 | * |
| 12 | * This file is part of the mLib utilities library. |
| 13 | * |
| 14 | * mLib is free software; you can redistribute it and/or modify |
| 15 | * it under the terms of the GNU General Public License as published by |
| 16 | * the Free Software Foundation; either version 2 of the License, or |
| 17 | * (at your option) any later version. |
| 18 | * |
| 19 | * mLib is distributed in the hope that it will be useful, |
| 20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 22 | * GNU General Public License for more details. |
| 23 | * |
| 24 | * You should have received a copy of the GNU General Public License |
| 25 | * along with mLib; if not, write to the Free Software Foundation, |
| 26 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 27 | */ |
| 28 | |
| 29 | /*----- Revision history --------------------------------------------------* |
| 30 | * |
| 31 | * $Log: dstr.h,v $ |
| 32 | * Revision 1.1 1998/06/17 23:44:42 mdw |
| 33 | * Initial revision |
| 34 | * |
| 35 | */ |
| 36 | |
| 37 | #ifndef DSTR_H |
| 38 | #define DSTR_H |
| 39 | |
| 40 | #ifdef __cplusplus |
| 41 | extern "C" { |
| 42 | #endif |
| 43 | |
| 44 | /*----- Rationale ---------------------------------------------------------* |
| 45 | * |
| 46 | * This file declares what is hopefully a fairly useful collection of |
| 47 | * primitive string handling functions. The idea is that the strings |
| 48 | * allocate memory for themselves as required. The @dstr@ routines don't |
| 49 | * assume any sort of terminator character, so arbitrary binary data can |
| 50 | * be stored in a dynamic string. With luck, this should put a stop to |
| 51 | * any buffer overflow problems. |
| 52 | */ |
| 53 | |
| 54 | /*----- Header files ------------------------------------------------------*/ |
| 55 | |
| 56 | #include <stdio.h> |
| 57 | |
| 58 | /*----- Data structures ---------------------------------------------------*/ |
| 59 | |
| 60 | typedef struct dstr { |
| 61 | char *buf; /* Pointer to string buffer */ |
| 62 | size_t sz; /* Size of the buffer */ |
| 63 | size_t len; /* Length of the string */ |
| 64 | } dstr; |
| 65 | |
| 66 | /*----- Functions provided ------------------------------------------------*/ |
| 67 | |
| 68 | /* --- @dstr_create@ --- * |
| 69 | * |
| 70 | * Arguments: @dstr *d@ = pointer to a dynamic string block |
| 71 | * |
| 72 | * Returns: --- |
| 73 | * |
| 74 | * Use: Initialises a dynamic string. |
| 75 | */ |
| 76 | |
| 77 | extern void dstr_create(dstr */*d*/); |
| 78 | |
| 79 | /* --- @dstr_destroy@ --- * |
| 80 | * |
| 81 | * Arguments: @dstr *d@ = pointer to a dynamic string block |
| 82 | * |
| 83 | * Returns: --- |
| 84 | * |
| 85 | * Use: Reclaims the space used by a dynamic string. |
| 86 | */ |
| 87 | |
| 88 | extern void dstr_destroy(dstr */*d*/); |
| 89 | |
| 90 | /* --- @dstr_reset@ --- * |
| 91 | * |
| 92 | * Arguments: @dstr *d@ = pointer to a dynaimc string block |
| 93 | * |
| 94 | * Returns: --- |
| 95 | * |
| 96 | * Use: Resets a string so that new data gets put at the beginning. |
| 97 | */ |
| 98 | |
| 99 | extern void dstr_reset(dstr */*d*/); |
| 100 | |
| 101 | /* --- @dstr_ensure@ --- * |
| 102 | * |
| 103 | * Arguments: @dstr *d@ = pointer to a dynamic string block |
| 104 | * @size_t sz@ = amount of free space to ensure |
| 105 | * |
| 106 | * Returns: --- |
| 107 | * |
| 108 | * Use: Ensures that at least @sz@ bytes are available in the |
| 109 | * given string. |
| 110 | */ |
| 111 | |
| 112 | extern void dstr_ensure(dstr */*d*/, size_t /*sz*/); |
| 113 | |
| 114 | #define DENSURE(d, rq) do { \ |
| 115 | if ((d)->len + (rq) > (d)->sz) dstr_ensure((d), (rq)); \ |
| 116 | } while (0) |
| 117 | |
| 118 | /* --- @dstr_putc@ --- * |
| 119 | * |
| 120 | * Arguments: @dstr *d@ = pointer to a dynamic string block |
| 121 | * @char ch@ = character to append |
| 122 | * |
| 123 | * Returns: --- |
| 124 | * |
| 125 | * Use: Appends a character to a string. |
| 126 | */ |
| 127 | |
| 128 | extern void dstr_putc(dstr */*d*/, char /*ch*/); |
| 129 | |
| 130 | #define DPUTC(d, ch) do { \ |
| 131 | DENSURE((d), 1); \ |
| 132 | (d)->buf[(d)->len++] = (ch); \ |
| 133 | } while (0) |
| 134 | |
| 135 | /* --- @dstr_putz@ --- * |
| 136 | * |
| 137 | * Arguments: @dstr *d@ = pointer to a dynamic string block |
| 138 | * |
| 139 | * Returns: --- |
| 140 | * |
| 141 | * Use: Appends a null byte to a string. The null byte does not |
| 142 | * contribute to the string's length, and will be overwritten |
| 143 | * by subsequent `put' operations. |
| 144 | */ |
| 145 | |
| 146 | extern void dstr_putz(dstr */*d*/); |
| 147 | |
| 148 | #define DPUTZ(d) do { \ |
| 149 | DENSURE((d), 1); \ |
| 150 | (d)->buf[(d)->len] = 0; \ |
| 151 | } while (0) |
| 152 | |
| 153 | /* --- @dstr_puts@ --- * |
| 154 | * |
| 155 | * Arguments: @dstr *d@ = pointer to a dynamic string block |
| 156 | * @const char *s@ = pointer to string to append |
| 157 | * |
| 158 | * Returns: --- |
| 159 | * |
| 160 | * Use: Appends a character string to a string. A trailing null |
| 161 | * byte is added, as for @dstr_putz@. |
| 162 | */ |
| 163 | |
| 164 | extern void dstr_puts(dstr */*d*/, const char */*s*/); |
| 165 | |
| 166 | #define DPUTS(d, s) do { \ |
| 167 | size_t sz = strlen(s); \ |
| 168 | DENSURE((d), sz + 1); \ |
| 169 | memcpy((d)->buf + (d)->len, (s), sz + 1); \ |
| 170 | (d)->len += sz; \ |
| 171 | } while (0) |
| 172 | |
| 173 | /* --- @dstr_putd@ --- * |
| 174 | * |
| 175 | * Arguments: @dstr *d@ = pointer to a dynamic string block |
| 176 | * @const dstr *s@ = pointer to a dynamic string to append |
| 177 | * |
| 178 | * Returns: --- |
| 179 | * |
| 180 | * Use: Appends a dynamic string to a string. A trailing null |
| 181 | * byte is added, as for @dstr_putz@. |
| 182 | */ |
| 183 | |
| 184 | extern void dstr_putd(dstr */*d*/, const dstr */*s*/); |
| 185 | |
| 186 | #define DPUTD(d, s) do { \ |
| 187 | DENSURE((d), (s)->len + 1); \ |
| 188 | memcpy((d)->buf + (d)->len, (s)->buf, (s)->len); \ |
| 189 | (d)->len += (s)->len; \ |
| 190 | (d)->buf[(d)->len] = 0; \ |
| 191 | } while (0) |
| 192 | |
| 193 | /* --- @dstr_putm@ --- * |
| 194 | * |
| 195 | * Arguments: @dstr *d@ = pointer to a dynamic string block |
| 196 | * @const void *p@ = pointer to a block to append |
| 197 | * @size_t sz@ = size of the block |
| 198 | * |
| 199 | * Returns: Appends an arbitrary data block to a string. No trailing |
| 200 | * null is appended. |
| 201 | */ |
| 202 | |
| 203 | extern void dstr_putm(dstr */*d*/, const void */*p*/, size_t /*sz*/); |
| 204 | |
| 205 | #define DPUTM(d, p, sz) do { \ |
| 206 | DENSURE((d), (sz)); \ |
| 207 | memcpy((d)->buf + (d)->len, (p), (sz)); \ |
| 208 | (d)->len += (sz); \ |
| 209 | } while (0) |
| 210 | |
| 211 | /* --- @dstr_tidy@ --- * |
| 212 | * |
| 213 | * Arguments: @dstr *d@ = pointer to a dynamic string block |
| 214 | * |
| 215 | * Returns: --- |
| 216 | * |
| 217 | * Use: Reduces the amount of memory used by a string. A trailing |
| 218 | * null byte is added, as for @dstr_putz@. |
| 219 | */ |
| 220 | |
| 221 | extern void dstr_tidy(dstr */*d*/); |
| 222 | |
| 223 | /* --- @dstr_putline@ --- * |
| 224 | * |
| 225 | * Arguments: @dstr *d@ = pointer to a dynamic string block |
| 226 | * @FILE *fp@ = a stream to read from |
| 227 | * |
| 228 | * Returns: The number of characters read into the buffer, or @EOF@ if |
| 229 | * end-of-file was reached before any characters were read. |
| 230 | * |
| 231 | * Use: Appends the next line from the given input stream to the |
| 232 | * string. A trailing newline is not added; a trailing null |
| 233 | * byte is appended, as for @dstr_putz@. |
| 234 | */ |
| 235 | |
| 236 | extern int dstr_putline(dstr */*d*/, FILE */*fp*/); |
| 237 | |
| 238 | /* --- @dstr_write@ --- * |
| 239 | * |
| 240 | * Arguments: @dstr *d@ = pointer to a dynamic string block |
| 241 | * @FILE *fp@ = a stream to write on |
| 242 | * |
| 243 | * Returns: The number of bytes written (as for @fwrite@). |
| 244 | * |
| 245 | * Use: Writes a dynamic string to a file. |
| 246 | */ |
| 247 | |
| 248 | extern size_t dstr_write(dstr */*d*/, FILE */*fp*/); |
| 249 | |
| 250 | /*----- That's all, folks -------------------------------------------------*/ |
| 251 | |
| 252 | #ifdef __cplusplus |
| 253 | } |
| 254 | #endif |
| 255 | |
| 256 | #endif |