head.c revision 1.8
1 /* $NetBSD: head.c,v 1.8 1998/12/19 16:32:52 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1980, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 #if 0 39 static char sccsid[] = "@(#)head.c 8.2 (Berkeley) 4/20/95"; 40 #else 41 __RCSID("$NetBSD: head.c,v 1.8 1998/12/19 16:32:52 christos Exp $"); 42 #endif 43 #endif /* not lint */ 44 45 #include "rcv.h" 46 #include "extern.h" 47 48 /* 49 * Mail -- a mail program 50 * 51 * Routines for processing and detecting headlines. 52 */ 53 54 /* 55 * See if the passed line buffer is a mail header. 56 * Return true if yes. Note the extreme pains to 57 * accomodate all funny formats. 58 */ 59 int 60 ishead(linebuf) 61 char linebuf[]; 62 { 63 char *cp; 64 struct headline hl; 65 char parbuf[BUFSIZ]; 66 67 cp = linebuf; 68 if (*cp++ != 'F' || *cp++ != 'r' || *cp++ != 'o' || *cp++ != 'm' || 69 *cp++ != ' ') 70 return (0); 71 parse(linebuf, &hl, parbuf); 72 if (hl.l_from == NOSTR || hl.l_date == NOSTR) { 73 fail(linebuf, "No from or date field"); 74 return (0); 75 } 76 if (!isdate(hl.l_date)) { 77 fail(linebuf, "Date field not legal date"); 78 return (0); 79 } 80 /* 81 * I guess we got it! 82 */ 83 return (1); 84 } 85 86 /*ARGSUSED*/ 87 void 88 fail(linebuf, reason) 89 char linebuf[], reason[]; 90 { 91 92 /* 93 if (value("debug") == NOSTR) 94 return; 95 fprintf(stderr, "\"%s\"\nnot a header because %s\n", linebuf, reason); 96 */ 97 } 98 99 /* 100 * Split a headline into its useful components. 101 * Copy the line into dynamic string space, then set 102 * pointers into the copied line in the passed headline 103 * structure. Actually, it scans. 104 */ 105 void 106 parse(line, hl, pbuf) 107 char line[], pbuf[]; 108 struct headline *hl; 109 { 110 char *cp; 111 char *sp; 112 char word[LINESIZE]; 113 114 hl->l_from = NOSTR; 115 hl->l_tty = NOSTR; 116 hl->l_date = NOSTR; 117 cp = line; 118 sp = pbuf; 119 /* 120 * Skip over "From" first. 121 */ 122 cp = nextword(cp, word); 123 cp = nextword(cp, word); 124 if (*word) 125 hl->l_from = copyin(word, &sp); 126 if (cp != NOSTR && cp[0] == 't' && cp[1] == 't' && cp[2] == 'y') { 127 cp = nextword(cp, word); 128 hl->l_tty = copyin(word, &sp); 129 } 130 if (cp != NOSTR) 131 hl->l_date = copyin(cp, &sp); 132 } 133 134 /* 135 * Copy the string on the left into the string on the right 136 * and bump the right (reference) string pointer by the length. 137 * Thus, dynamically allocate space in the right string, copying 138 * the left string into it. 139 */ 140 char * 141 copyin(src, space) 142 char *src; 143 char **space; 144 { 145 char *cp; 146 char *top; 147 148 top = cp = *space; 149 while ((*cp++ = *src++) != '\0') 150 ; 151 *space = cp; 152 return (top); 153 } 154 155 /* 156 * Test to see if the passed string is a ctime(3) generated 157 * date string as documented in the manual. The template 158 * below is used as the criterion of correctness. 159 * Also, we check for a possible trailing time zone using 160 * the tmztype template. 161 */ 162 163 /* 164 * 'A' An upper case char 165 * 'a' A lower case char 166 * ' ' A space 167 * '0' A digit 168 * 'O' An optional digit or space 169 * ':' A colon 170 * 'N' A new line 171 */ 172 char ctype[] = "Aaa Aaa O0 00:00:00 0000"; 173 char SysV_ctype[] = "Aaa Aaa O0 00:00 0000"; 174 char tmztype[] = "Aaa Aaa O0 00:00:00 AAA 0000"; 175 char SysV_tmztype[] = "Aaa Aaa O0 00:00 AAA 0000"; 176 177 int 178 isdate(date) 179 char date[]; 180 { 181 182 return cmatch(date, ctype) || 183 cmatch(date, tmztype) || 184 cmatch(date, SysV_tmztype) || cmatch(date, SysV_ctype); 185 } 186 187 /* 188 * Match the given string (cp) against the given template (tp). 189 * Return 1 if they match, 0 if they don't 190 */ 191 int 192 cmatch(cp, tp) 193 char *cp, *tp; 194 { 195 196 while (*cp && *tp) 197 switch (*tp++) { 198 case 'a': 199 if (!islower((unsigned char)*cp++)) 200 return 0; 201 break; 202 case 'A': 203 if (!isupper((unsigned char)*cp++)) 204 return 0; 205 break; 206 case ' ': 207 if (*cp++ != ' ') 208 return 0; 209 break; 210 case '0': 211 if (!isdigit((unsigned char)*cp++)) 212 return 0; 213 break; 214 case 'O': 215 if (*cp != ' ' && !isdigit((unsigned char)*cp)) 216 return 0; 217 cp++; 218 break; 219 case ':': 220 if (*cp++ != ':') 221 return 0; 222 break; 223 case 'N': 224 if (*cp++ != '\n') 225 return 0; 226 break; 227 } 228 if (*cp || *tp) 229 return 0; 230 return (1); 231 } 232 233 /* 234 * Collect a liberal (space, tab delimited) word into the word buffer 235 * passed. Also, return a pointer to the next word following that, 236 * or NOSTR if none follow. 237 */ 238 char * 239 nextword(wp, wbuf) 240 char *wp, *wbuf; 241 { 242 int c; 243 244 if (wp == NOSTR) { 245 *wbuf = 0; 246 return (NOSTR); 247 } 248 while ((c = *wp++) && c != ' ' && c != '\t') { 249 *wbuf++ = c; 250 if (c == '"') { 251 while ((c = *wp++) && c != '"') 252 *wbuf++ = c; 253 if (c == '"') 254 *wbuf++ = c; 255 else 256 wp--; 257 } 258 } 259 *wbuf = '\0'; 260 for (; c == ' ' || c == '\t'; c = *wp++) 261 ; 262 if (c == 0) 263 return (NOSTR); 264 return (wp - 1); 265 } 266
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