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 == NULL || hl.l_date == NULL) { 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 const char *linebuf, *reason; 84 { 85 86 /* 87 if (value("debug") == NULL) 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 struct headline *hl; 103 { 104 char *cp, *sp; 105 char word[LINESIZE]; 106 107 hl->l_from = NULL; 108 hl->l_tty = NULL; 109 hl->l_date = NULL; 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 != '\0') 118 hl->l_from = copyin(word, &sp); 119 if (cp != NULL && 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 != NULL) 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 char *src; 136 char **space; 137 { 138 char *cp, *top; 139 140 top = cp = *space; 141 while ((*cp++ = *src++) != '\0') 142 ; 143 *space = cp; 144 return (top); 145 } 146 147 /* 148 * Test to see if the passed string is a ctime(3) generated 149 * date string as documented in the manual. The template 150 * below is used as the criterion of correctness. 151 * Also, we check for a possible trailing time zone using 152 * the tmztype template. 153 */ 154 155 /* 156 * 'A' An upper case char 157 * 'a' A lower case char 158 * ' ' A space 159 * '0' A digit 160 * 'O' An optional digit or space 161 * ':' A colon 162 * 'N' A new line 163 */ 164 char ctype[] = "Aaa Aaa O0 00:00:00 0000"; 165 char tmztype[] = "Aaa Aaa O0 00:00:00 AAA 0000"; 166 167 int 168 isdate(date) 169 char date[]; 170 { 171 172 return (cmatch(date, ctype) || cmatch(date, tmztype)); 173 } 174 175 /* 176 * Match the given string (cp) against the given template (tp). 177 * Return 1 if they match, 0 if they don't 178 */ 179 int 180 cmatch(cp, tp) 181 char *cp, *tp; 182 { 183 184 while (*cp != '\0' && *tp != '\0') 185 switch (*tp++) { 186 case 'a': 187 if (!islower(*cp++)) 188 return (0); 189 break; 190 case 'A': 191 if (!isupper(*cp++)) 192 return (0); 193 break; 194 case ' ': 195 if (*cp++ != ' ') 196 return (0); 197 break; 198 case '0': 199 if (!isdigit(*cp++)) 200 return (0); 201 break; 202 case 'O': 203 if (*cp != ' ' && !isdigit(*cp)) 204 return (0); 205 cp++; 206 break; 207 case ':': 208 if (*cp++ != ':') 209 return (0); 210 break; 211 case 'N': 212 if (*cp++ != '\n') 213 return (0); 214 break; 215 } 216 if (*cp != '\0' || *tp != '\0') 217 return (0); 218 return (1); 219 } 220 221 /* 222 * Collect a liberal (space, tab delimited) word into the word buffer 223 * passed. Also, return a pointer to the next word following that, 224 * or NULL if none follow. 225 */ 226 char * 227 nextword(wp, wbuf) 228 char *wp, *wbuf; 229 { 230 int c; 231 232 if (wp == NULL) { 233 *wbuf = '\0'; 234 return (NULL); 235 } 236 while ((c = *wp++) != '\0' && c != ' ' && c != '\t') { 237 *wbuf++ = c; 238 if (c == '"') { 239 while ((c = *wp++) != '\0' && c != '"') 240 *wbuf++ = c; 241 if (c == '"') 242 *wbuf++ = c; 243 else 244 wp--; 245 } 246 } 247 *wbuf = '\0'; 248 for (; c == ' ' || c == '\t'; c = *wp++) 249 ; 250 if (c == '\0') 251 return (NULL); 252 return (wp - 1); 253 } 254