1 /* 2 * Copyright (C) 1984-2011 Mark Nudelman 3 * 4 * You may distribute under the terms of either the GNU General Public 5 * License or the Less License, as specified in the README file. 6 * 7 * For more information about less, or for information on how to 8 * contact the author, see the README file. 9 */ 10 11 12 /* 13 * lessecho [-ox] [-cx] [-pn] [-dn] [-a] file ... 14 * Simply echos its filename arguments on standard output. 15 * But any argument containing spaces is enclosed in quotes. 16 * 17 * -ox Specifies "x" to be the open quote character. 18 * -cx Specifies "x" to be the close quote character. 19 * -pn Specifies "n" to be the open quote character, as an integer. 20 * -dn Specifies "n" to be the close quote character, as an integer. 21 * -mx Specifies "x" to be a metachar. 22 * -nn Specifies "n" to be a metachar, as an integer. 23 * -ex Specifies "x" to be the escape char for metachars. 24 * -fn Specifies "x" to be the escape char for metachars, as an integer. 25 * -a Specifies that all arguments are to be quoted. 26 * The default is that only arguments containing spaces are quoted. 27 */ 28 29 #include "less.h" 30 31 static char *version = "$Revision: 1.14 $"; 32 33 static int quote_all = 0; 34 static char openquote = '"'; 35 static char closequote = '"'; 36 static char *meta_escape = "\\"; 37 static char meta_escape_buf[2]; 38 static char metachars[64] = ""; 39 static int num_metachars = 0; 40 41 static void 42 pr_usage() 43 { 44 fprintf(stderr, 45 "usage: lessecho [-ox] [-cx] [-pn] [-dn] [-mx] [-nn] [-ex] [-fn] [-a] file ...\n"); 46 } 47 48 static void 49 pr_version() 50 { 51 char *p; 52 char buf[10]; 53 char *pbuf = buf; 54 55 for (p = version; *p != ' '; p++) 56 if (*p == '\0') 57 return; 58 for (p++; *p != '$' && *p != ' ' && *p != '\0'; p++) 59 *pbuf++ = *p; 60 *pbuf = '\0'; 61 printf("%s\n", buf); 62 } 63 64 static void 65 pr_error(s) 66 char *s; 67 { 68 fprintf(stderr, "%s\n", s); 69 exit(1); 70 } 71 72 static long 73 lstrtol(s, radix, pend) 74 char *s; 75 int radix; 76 char **pend; 77 { 78 int v; 79 int neg = 0; 80 long n = 0; 81 82 /* Skip leading white space. */ 83 while (*s == ' ' || *s == '\t') 84 s++; 85 86 /* Check for a leading + or -. */ 87 if (*s == '-') 88 { 89 neg = 1; 90 s++; 91 } else if (*s == '+') 92 { 93 s++; 94 } 95 96 /* Determine radix if caller does not specify. */ 97 if (radix == 0) 98 { 99 radix = 10; 100 if (*s == '0') 101 { 102 switch (*++s) 103 { 104 case 'x': 105 radix = 16; 106 s++; 107 break; 108 default: 109 radix = 8; 110 break; 111 } 112 } 113 } 114 115 /* Parse the digits of the number. */ 116 for (;;) 117 { 118 if (*s >= '0' && *s <= '9') 119 v = *s - '0'; 120 else if (*s >= 'a' && *s <= 'f') 121 v = *s - 'a' + 10; 122 else if (*s >= 'A' && *s <= 'F') 123 v = *s - 'A' + 10; 124 else 125 break; 126 if (v >= radix) 127 break; 128 n = n * radix + v; 129 s++; 130 } 131 132 if (pend != NULL) 133 { 134 /* Skip trailing white space. */ 135 while (*s == ' ' || *s == '\t') 136 s++; 137 *pend = s; 138 } 139 if (neg) 140 return (-n); 141 return (n); 142 } 143 144 145 #if !HAVE_STRCHR 146 char * 147 strchr(s, c) 148 char *s; 149 int c; 150 { 151 for ( ; *s != '\0'; s++) 152 if (*s == c) 153 return (s); 154 if (c == '\0') 155 return (s); 156 return (NULL); 157 } 158 #endif 159 160 int 161 main(argc, argv) 162 int argc; 163 char *argv[]; 164 { 165 char *arg; 166 char *s; 167 int no_more_options; 168 169 no_more_options = 0; 170 while (--argc > 0) 171 { 172 arg = *++argv; 173 if (*arg != '-' || no_more_options) 174 break; 175 switch (*++arg) 176 { 177 case 'a': 178 quote_all = 1; 179 break; 180 case 'c': 181 closequote = *++arg; 182 break; 183 case 'd': 184 closequote = lstrtol(++arg, 0, &s); 185 if (s == arg) 186 pr_error("Missing number after -d"); 187 break; 188 case 'e': 189 if (strcmp(++arg, "-") == 0) 190 meta_escape = ""; 191 else 192 meta_escape = arg; 193 break; 194 case 'f': 195 meta_escape_buf[0] = lstrtol(++arg, 0, &s); 196 meta_escape = meta_escape_buf; 197 if (s == arg) 198 pr_error("Missing number after -f"); 199 break; 200 case 'o': 201 openquote = *++arg; 202 break; 203 case 'p': 204 openquote = lstrtol(++arg, 0, &s); 205 if (s == arg) 206 pr_error("Missing number after -p"); 207 break; 208 case 'm': 209 metachars[num_metachars++] = *++arg; 210 metachars[num_metachars] = '\0'; 211 break; 212 case 'n': 213 metachars[num_metachars++] = lstrtol(++arg, 0, &s); 214 if (s == arg) 215 pr_error("Missing number after -n"); 216 metachars[num_metachars] = '\0'; 217 break; 218 case '?': 219 pr_usage(); 220 return (0); 221 case '-': 222 if (*++arg == '\0') 223 { 224 no_more_options = 1; 225 break; 226 } 227 if (strcmp(arg, "version") == 0) 228 { 229 pr_version(); 230 return (0); 231 } 232 if (strcmp(arg, "help") == 0) 233 { 234 pr_usage(); 235 return (0); 236 } 237 pr_error("Invalid option after --"); 238 default: 239 pr_error("Invalid option letter"); 240 } 241 } 242 243 while (argc-- > 0) 244 { 245 int has_meta = 0; 246 arg = *argv++; 247 for (s = arg; *s != '\0'; s++) 248 { 249 if (strchr(metachars, *s) != NULL) 250 { 251 has_meta = 1; 252 break; 253 } 254 } 255 if (quote_all || (has_meta && strlen(meta_escape) == 0)) 256 printf("%c%s%c", openquote, arg, closequote); 257 else 258 { 259 for (s = arg; *s != '\0'; s++) 260 { 261 if (strchr(metachars, *s) != NULL) 262 printf("%s", meta_escape); 263 printf("%c", *s); 264 } 265 } 266 if (argc > 0) 267 printf(" "); 268 else 269 printf("\n"); 270 } 271 return (0); 272 } 273