1 /* 2 * argv_parse.c --- utility function for parsing a string into a 3 * argc, argv array. 4 * 5 * This file defines a function argv_parse() which parsing a 6 * passed-in string, handling double quotes and backslashes, and 7 * creates an allocated argv vector which can be freed using the 8 * argv_free() function. 9 * 10 * See argv_parse.h for the formal definition of the functions. 11 * 12 * Copyright 1999 by Theodore Ts'o. 13 * 14 * Permission to use, copy, modify, and distribute this software for 15 * any purpose with or without fee is hereby granted, provided that 16 * the above copyright notice and this permission notice appear in all 17 * copies. THE SOFTWARE IS PROVIDED "AS IS" AND THEODORE TS'O (THE 18 * AUTHOR) DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, 19 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, 21 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER 22 * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION 23 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR 24 * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. (Isn't 25 * it sick that the U.S. culture of lawsuit-happy lawyers requires 26 * this kind of disclaimer?) 27 * 28 * Version 1.1, modified 2/27/1999 29 */ 30 31 #include "config.h" 32 #ifdef HAVE_STDLIB_H 33 #include <stdlib.h> 34 #endif 35 #include <ctype.h> 36 #include <string.h> 37 #include "argv_parse.h" 38 39 #define STATE_WHITESPACE 1 40 #define STATE_TOKEN 2 41 #define STATE_QUOTED 3 42 43 /* 44 * Returns 0 on success, -1 on failure. 45 */ 46 int argv_parse(char *in_buf, int *ret_argc, char ***ret_argv) 47 { 48 int argc = 0, max_argc = 0; 49 char **argv, **new_argv, *buf, ch; 50 char *cp = 0, *outcp = 0; 51 int state = STATE_WHITESPACE; 52 53 buf = malloc(strlen(in_buf)+1); 54 if (!buf) 55 return -1; 56 57 max_argc = 0; argc = 0; argv = 0; 58 outcp = buf; 59 for (cp = in_buf; (ch = *cp); cp++) { 60 if (state == STATE_WHITESPACE) { 61 if (isspace((int) ch)) 62 continue; 63 /* Not whitespace, so start a new token */ 64 state = STATE_TOKEN; 65 if (argc >= max_argc) { 66 max_argc += 3; 67 new_argv = realloc(argv, 68 (max_argc+1)*sizeof(char *)); 69 if (!new_argv) { 70 free(argv); 71 free(buf); 72 return -1; 73 } 74 argv = new_argv; 75 } 76 argv[argc++] = outcp; 77 } 78 if (state == STATE_QUOTED) { 79 if (ch == '"') 80 state = STATE_TOKEN; 81 else 82 *outcp++ = ch; 83 continue; 84 } 85 /* Must be processing characters in a word */ 86 if (isspace((int) ch)) { 87 /* 88 * Terminate the current word and start 89 * looking for the beginning of the next word. 90 */ 91 *outcp++ = 0; 92 state = STATE_WHITESPACE; 93 continue; 94 } 95 if (ch == '"') { 96 state = STATE_QUOTED; 97 continue; 98 } 99 if (ch == '\\') { 100 ch = *++cp; 101 switch (ch) { 102 case '\0': 103 ch = '\\'; cp--; break; 104 case 'n': 105 ch = '\n'; break; 106 case 't': 107 ch = '\t'; break; 108 case 'b': 109 ch = '\b'; break; 110 } 111 } 112 *outcp++ = ch; 113 } 114 if (state != STATE_WHITESPACE) 115 *outcp++ = '\0'; 116 if (argv == 0) { 117 argv = malloc(sizeof(char *)); 118 free(buf); 119 } 120 argv[argc] = 0; 121 if (ret_argc) 122 *ret_argc = argc; 123 if (ret_argv) 124 *ret_argv = argv; 125 return 0; 126 } 127 128 void argv_free(char **argv) 129 { 130 free(*argv); 131 free(argv); 132 } 133 134 #ifdef DEBUG 135 /* 136 * For debugging 137 */ 138 139 #include <stdio.h> 140 141 int main(int argc, char **argv) 142 { 143 int ac, ret; 144 char **av, **cpp; 145 char buf[256]; 146 147 while (!feof(stdin)) { 148 if (fgets(buf, sizeof(buf), stdin) == NULL) 149 break; 150 ret = argv_parse(buf, &ac, &av); 151 if (ret != 0) { 152 printf("Argv_parse returned %d!\n", ret); 153 continue; 154 } 155 printf("Argv_parse returned %d arguments...\n", ac); 156 for (cpp = av; *cpp; cpp++) { 157 if (cpp != av) 158 printf(", "); 159 printf("'%s'", *cpp); 160 } 161 printf("\n"); 162 argv_free(av); 163 } 164 exit(0); 165 } 166 #endif /* DEBUG */ 167
