1 /* 2 * Copyright (c) 1980, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifndef lint 35 static char sccsid[] = "@(#)head.c 8.1 (Berkeley) 6/6/93"; 36 #endif /* not lint */ 37 38 #include "rcv.h" 39 #include "extern.h" 40 41 /* 42 * Mail -- a mail program 43 * 44 * Routines for processing and detecting headlines. 45 */ 46 47 /* 48 * See if the passed line buffer is a mail header. 49 * Return true if yes. Note the extreme pains to 50 * accomodate all funny formats. 51 */ 52 int 53 ishead(linebuf) 54 char linebuf[]; 55 { 56 register char *cp; 57 struct headline hl; 58 char parbuf[BUFSIZ]; 59 60 cp = linebuf; 61 if (*cp++ != 'F' || *cp++ != 'r' || *cp++ != 'o' || *cp++ != 'm' || 62 *cp++ != ' ') 63 return (0); 64 parse(linebuf, &hl, parbuf); 65 if (hl.l_from == NOSTR || hl.l_date == NOSTR) { 66 fail(linebuf, "No from or date field"); 67 return (0); 68 } 69 if (!isdate(hl.l_date)) { 70 fail(linebuf, "Date field not legal date"); 71 return (0); 72 } 73 /* 74 * I guess we got it! 75 */ 76 return (1); 77 } 78 79 /*ARGSUSED*/ 80 void 81 fail(linebuf, reason) 82 char linebuf[], reason[]; 83 { 84 85 /* 86 if (value("debug") == NOSTR) 87 return; 88 fprintf(stderr, "\"%s\"\nnot a header because %s\n", linebuf, reason); 89 */ 90 } 91 92 /* 93 * Split a headline into its useful components. 94 * Copy the line into dynamic string space, then set 95 * pointers into the copied line in the passed headline 96 * structure. Actually, it scans. 97 */ 98 void 99 parse(line, hl, pbuf) 100 char line[], pbuf[]; 101 register struct headline *hl; 102 { 103 register char *cp; 104 char *sp; 105 char word[LINESIZE]; 106 107 hl->l_from = NOSTR; 108 hl->l_tty = NOSTR; 109 hl->l_date = NOSTR; 110 cp = line; 111 sp = pbuf; 112 /* 113 * Skip over "From" first. 114 */ 115 cp = nextword(cp, word); 116 cp = nextword(cp, word); 117 if (*word) 118 hl->l_from = copyin(word, &sp); 119 if (cp != NOSTR && cp[0] == 't' && cp[1] == 't' && cp[2] == 'y') { 120 cp = nextword(cp, word); 121 hl->l_tty = copyin(word, &sp); 122 } 123 if (cp != NOSTR) 124 hl->l_date = copyin(cp, &sp); 125 } 126 127 /* 128 * Copy the string on the left into the string on the right 129 * and bump the right (reference) string pointer by the length. 130 * Thus, dynamically allocate space in the right string, copying 131 * the left string into it. 132 */ 133 char * 134 copyin(src, space) 135 register char *src; 136 char **space; 137 { 138 register char *cp; 139 char *top; 140 141 top = cp = *space; 142 while (*cp++ = *src++) 143 ; 144 *space = cp; 145 return (top); 146 } 147 148 /* 149 * Test to see if the passed string is a ctime(3) generated 150 * date string as documented in the manual. The template 151 * below is used as the criterion of correctness. 152 * Also, we check for a possible trailing time zone using 153 * the tmztype template. 154 */ 155 156 /* 157 * 'A' An upper case char 158 * 'a' A lower case char 159 * ' ' A space 160 * '0' A digit 161 * 'O' An optional digit or space 162 * ':' A colon 163 * 'N' A new line 164 */ 165 char ctype[] = "Aaa Aaa O0 00:00:00 0000"; 166 char tmztype[] = "Aaa Aaa O0 00:00:00 AAA 0000"; 167 168 int 169 isdate(date) 170 char date[]; 171 { 172 173 return cmatch(date, ctype) || cmatch(date, tmztype); 174 } 175 176 /* 177 * Match the given string (cp) against the given template (tp). 178 * Return 1 if they match, 0 if they don't 179 */ 180 int 181 cmatch(cp, tp) 182 register char *cp, *tp; 183 { 184 185 while (*cp && *tp) 186 switch (*tp++) { 187 case 'a': 188 if (!islower(*cp++)) 189 return 0; 190 break; 191 case 'A': 192 if (!isupper(*cp++)) 193 return 0; 194 break; 195 case ' ': 196 if (*cp++ != ' ') 197 return 0; 198 break; 199 case '0': 200 if (!isdigit(*cp++)) 201 return 0; 202 break; 203 case 'O': 204 if (*cp != ' ' && !isdigit(*cp)) 205 return 0; 206 cp++; 207 break; 208 case ':': 209 if (*cp++ != ':') 210 return 0; 211 break; 212 case 'N': 213 if (*cp++ != '\n') 214 return 0; 215 break; 216 } 217 if (*cp || *tp) 218 return 0; 219 return (1); 220 } 221 222 /* 223 * Collect a liberal (space, tab delimited) word into the word buffer 224 * passed. Also, return a pointer to the next word following that, 225 * or NOSTR if none follow. 226 */ 227 char * 228 nextword(wp, wbuf) 229 register char *wp, *wbuf; 230 { 231 register c; 232 233 if (wp == NOSTR) { 234 *wbuf = 0; 235 return (NOSTR); 236 } 237 while ((c = *wp++) && c != ' ' && c != '\t') { 238 *wbuf++ = c; 239 if (c == '"') { 240 while ((c = *wp++) && c != '"') 241 *wbuf++ = c; 242 if (c == '"') 243 *wbuf++ = c; 244 else 245 wp--; 246 } 247 } 248 *wbuf = '\0'; 249 for (; c == ' ' || c == '\t'; c = *wp++) 250 ; 251 if (c == 0) 252 return (NOSTR); 253 return (wp - 1); 254 } 255