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