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Annotation of 43BSDReno/usr.bin/from/from.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1980, 1988 The Regents of the University of California.
                      3:  * All rights reserved.
                      4:  *
                      5:  * Redistribution and use in source and binary forms are permitted provided
                      6:  * that: (1) source distributions retain this entire copyright notice and
                      7:  * comment, and (2) distributions including binaries display the following
                      8:  * acknowledgement:  ``This product includes software developed by the
                      9:  * University of California, Berkeley and its contributors'' in the
                     10:  * documentation or other materials provided with the distribution and in
                     11:  * all advertising materials mentioning features or use of this software.
                     12:  * Neither the name of the University nor the names of its contributors may
                     13:  * be used to endorse or promote products derived from this software without
                     14:  * specific prior written permission.
                     15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
                     16:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
                     17:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     18:  */
                     19: 
                     20: #ifndef lint
                     21: char copyright[] =
                     22: "@(#) Copyright (c) 1980, 1988 The Regents of the University of California.\n\
                     23:  All rights reserved.\n";
                     24: #endif /* not lint */
                     25: 
                     26: #ifndef lint
                     27: static char sccsid[] = "@(#)from.c     5.6 (Berkeley) 7/21/90";
                     28: #endif /* not lint */
                     29: 
                     30: #include <sys/types.h>
                     31: #include <ctype.h>
                     32: #include <pwd.h>
                     33: #include <stdio.h>
                     34: #include <paths.h>
                     35: 
                     36: main(argc, argv)
                     37:        int argc;
                     38:        char **argv;
                     39: {
                     40:        extern char *optarg;
                     41:        extern int optind;
                     42:        struct passwd *pwd, *getpwuid();
                     43:        int ch, newline;
                     44:        char *file, *sender, *p;
                     45: #if MAXPATHLEN > BUFSIZ
                     46:        char buf[MAXPATHLEN];
                     47: #else
                     48:        char buf[BUFSIZ];
                     49: #endif
                     50: 
                     51:        file = sender = NULL;
                     52:        while ((ch = getopt(argc, argv, "f:s:")) != EOF)
                     53:                switch((char)ch) {
                     54:                case 'f':
                     55:                        file = optarg;
                     56:                        break;
                     57:                case 's':
                     58:                        sender = optarg;
                     59:                        for (p = sender; *p; ++p)
                     60:                                if (isupper(*p))
                     61:                                        *p = tolower(*p);
                     62:                        break;
                     63:                case '?':
                     64:                default:
                     65:                        fprintf(stderr, "usage: from [-f file] [-s sender] [user]\n");
                     66:                        exit(1);
                     67:                }
                     68:        argv += optind;
                     69: 
                     70:        if (!file) {
                     71:                if (!(file = *argv)) {
                     72:                        if (!(pwd = getpwuid(getuid()))) {
                     73:                                fprintf(stderr,
                     74:                                    "from: no password file entry for you.\n");
                     75:                                exit(1);
                     76:                        }
                     77:                        file = pwd->pw_name;
                     78:                }
                     79:                (void)sprintf(buf, "%s/%s", _PATH_MAILDIR, file);
                     80:                file = buf;
                     81:        }
                     82:        if (!freopen(file, "r", stdin)) {
                     83:                fprintf(stderr, "from: can't read %s.\n", file);
                     84:                exit(1);
                     85:        }
                     86:        for (newline = 1; fgets(buf, sizeof(buf), stdin);) {
                     87:                if (*buf == '\n') {
                     88:                        newline = 1;
                     89:                        continue;
                     90:                }
                     91:                if (newline && !strncmp(buf, "From ", 5) &&
                     92:                    (!sender || match(buf + 5, sender)))
                     93:                        printf("%s", buf);
                     94:                newline = 0;
                     95:        }
                     96:        exit(0);
                     97: }
                     98: 
                     99: match(line, sender)
                    100:        register char *line, *sender;
                    101: {
                    102:        register char ch, pch, first, *p, *t;
                    103: 
                    104:        for (first = *sender++;;) {
                    105:                if (isspace(ch = *line))
                    106:                        return(0);
                    107:                ++line;
                    108:                if (isupper(ch))
                    109:                        ch = tolower(ch);
                    110:                if (ch != first)
                    111:                        continue;
                    112:                for (p = sender, t = line;;) {
                    113:                        if (!(pch = *p++))
                    114:                                return(1);
                    115:                        if (isupper(ch = *t++))
                    116:                                ch = tolower(ch);
                    117:                        if (ch != pch)
                    118:                                break;
                    119:                }
                    120:        }
                    121:        /* NOTREACHED */
                    122: }

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