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 #if 0 36 static char sccsid[] = "@(#)head.c 8.1 (Berkeley) 6/6/93"; 37 #endif 38 static const char rcsid[] = 39 "$FreeBSD$"; 40 #endif /* not lint */ 41 42 #include "rcv.h" 43 #include "extern.h" 44 45 /* 46 * Mail -- a mail program 47 * 48 * Routines for processing and detecting headlines. 49 */ 50 51 /* 52 * See if the passed line buffer is a mail header. 53 * Return true if yes. Note the extreme pains to 54 * accomodate all funny formats. 55 */ 56 int 57 ishead(linebuf) 58 char linebuf[]; 59 { 60 struct headline hl; 61 char parbuf[BUFSIZ]; 62 63 if (strncmp(linebuf, "From ", 5)) 64 return (0); 65 parse(linebuf, &hl, parbuf); 66 if (hl.l_from == NOSTR || hl.l_date == NOSTR) { 67 fail(linebuf, "No from or date field"); 68 return (0); 69 } 70 if (!isdate(hl.l_date)) { 71 fail(linebuf, "Date field not legal date"); 72 return (0); 73 } 74 /* 75 * I guess we got it! 76 */ 77 return (1); 78 } 79 80 /*ARGSUSED*/ 81 void 82 fail(linebuf, reason) 83 char linebuf[], reason[]; 84 { 85 86 /* 87 if (value("debug") == NOSTR) 88 return; 89 fprintf(stderr, "\"%s\"\nnot a header because %s\n", linebuf, reason); 90 */ 91 } 92 93 /* 94 * Split a headline into its useful components. 95 * Copy the line into dynamic string space, then set 96 * pointers into the copied line in the passed headline 97 * structure. Actually, it scans. 98 */ 99 void 100 parse(line, hl, pbuf) 101 char line[], pbuf[]; 102 register struct headline *hl; 103 { 104 register char *cp; 105 char *sp; 106 char word[LINESIZE]; 107 108 hl->l_from = NOSTR; 109 hl->l_tty = NOSTR; 110 hl->l_date = NOSTR; 111 cp = line; 112 sp = pbuf; 113 /* 114 * Skip over "From" first. 115 */ 116 cp = nextword(cp, word); 117 cp = nextword(cp, word); 118 if (*word) 119 hl->l_from = copyin(word, &sp); 120 if (cp != NOSTR && cp[0] == 't' && cp[1] == 't' && cp[2] == 'y') { 121 cp = nextword(cp, word); 122 hl->l_tty = copyin(word, &sp); 123 } 124 if (cp != NOSTR) 125 hl->l_date = copyin(cp, &sp); 126 } 127 128 /* 129 * Copy the string on the left into the string on the right 130 * and bump the right (reference) string pointer by the length. 131 * Thus, dynamically allocate space in the right string, copying 132 * the left string into it. 133 */ 134 char * 135 copyin(src, space) 136 register char *src; 137 char **space; 138 { 139 register char *cp; 140 char *top; 141 142 top = cp = *space; 143 while (*cp++ = *src++) 144 ; 145 *space = cp; 146 return (top); 147 } 148 149 /* 150 * Test to see if the passed string is a ctime(3) generated 151 * date string as documented in the manual. The template 152 * below is used as the criterion of correctness. 153 * Also, we check for a possible trailing time zone using 154 * the tmztype template. 155 */ 156 157 /* 158 * 'A' An upper case char 159 * 'a' A lower case char 160 * ' ' A space 161 * '0' A digit 162 * 'O' An optional digit or space 163 * ':' A colon 164 * 'N' A new line 165 */ 166 char ctype[] = "Aaa Aaa O0 00:00:00 0000"; 167 char tmztype[] = "Aaa Aaa O0 00:00:00 AAA 0000"; 168 169 int 170 isdate(date) 171 char date[]; 172 { 173 174 return cmatch(date, ctype) || cmatch(date, tmztype); 175 } 176 177 /* 178 * Match the given string (cp) against the given template (tp). 179 * Return 1 if they match, 0 if they don't 180 */ 181 int 182 cmatch(cp, tp) 183 register char *cp, *tp; 184 { 185 186 while (*cp && *tp) 187 switch (*tp++) { 188 case 'a': 189 if (!islower(*cp++)) 190 return 0; 191 break; 192 case 'A': 193 if (!isupper(*cp++)) 194 return 0; 195 break; 196 case ' ': 197 if (*cp++ != ' ') 198 return 0; 199 break; 200 case '0': 201 if (!isdigit(*cp++)) 202 return 0; 203 break; 204 case 'O': 205 if (*cp != ' ' && !isdigit(*cp)) 206 return 0; 207 cp++; 208 break; 209 case ':': 210 if (*cp++ != ':') 211 return 0; 212 break; 213 case 'N': 214 if (*cp++ != '\n') 215 return 0; 216 break; 217 } 218 if (*cp || *tp) 219 return 0; 220 return (1); 221 } 222 223 /* 224 * Collect a liberal (space, tab delimited) word into the word buffer 225 * passed. Also, return a pointer to the next word following that, 226 * or NOSTR if none follow. 227 */ 228 char * 229 nextword(wp, wbuf) 230 register char *wp, *wbuf; 231 { 232 register c; 233 234 if (wp == NOSTR) { 235 *wbuf = 0; 236 return (NOSTR); 237 } 238 while ((c = *wp++) && c != ' ' && c != '\t') { 239 *wbuf++ = c; 240 if (c == '"') { 241 while ((c = *wp++) && c != '"') 242 *wbuf++ = c; 243 if (c == '"') 244 *wbuf++ = c; 245 else 246 wp--; 247 } 248 } 249 *wbuf = '\0'; 250 for (; c == ' ' || c == '\t'; c = *wp++) 251 ; 252 if (c == 0) 253 return (NOSTR); 254 return (wp - 1); 255 } 256