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Annotation of 43BSDTahoe/usr.bin/uucp/uudecode.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1983 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that the above copyright notice and this paragraph are
        !             7:  * duplicated in all such forms and that any documentation,
        !             8:  * advertising materials, and other materials related to such
        !             9:  * distribution and use acknowledge that the software was developed
        !            10:  * by the University of California, Berkeley.  The name of the
        !            11:  * University may not be used to endorse or promote products derived
        !            12:  * from this software without specific prior written permission.
        !            13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            16:  */
        !            17: 
        !            18: #ifndef lint
        !            19: static char sccsid[] = "@(#)uudecode.c 5.5 (Berkeley) 7/6/88";
        !            20: #endif /* not lint */
        !            21: 
        !            22: /*
        !            23:  * uudecode [input]
        !            24:  *
        !            25:  * create the specified file, decoding as you go.
        !            26:  * used with uuencode.
        !            27:  */
        !            28: #include <stdio.h>
        !            29: #include <pwd.h>
        !            30: #include <sys/types.h>
        !            31: #include <sys/stat.h>
        !            32: 
        !            33: /* single character decode */
        !            34: #define DEC(c) (((c) - ' ') & 077)
        !            35: 
        !            36: main(argc, argv)
        !            37: char **argv;
        !            38: {
        !            39:        FILE *in, *out;
        !            40:        int mode;
        !            41:        char dest[128];
        !            42:        char buf[80];
        !            43: 
        !            44:        /* optional input arg */
        !            45:        if (argc > 1) {
        !            46:                if ((in = fopen(argv[1], "r")) == NULL) {
        !            47:                        perror(argv[1]);
        !            48:                        exit(1);
        !            49:                }
        !            50:                argv++; argc--;
        !            51:        } else
        !            52:                in = stdin;
        !            53: 
        !            54:        if (argc != 1) {
        !            55:                printf("Usage: uudecode [infile]\n");
        !            56:                exit(2);
        !            57:        }
        !            58: 
        !            59:        /* search for header line */
        !            60:        for (;;) {
        !            61:                if (fgets(buf, sizeof buf, in) == NULL) {
        !            62:                        fprintf(stderr, "No begin line\n");
        !            63:                        exit(3);
        !            64:                }
        !            65:                if (strncmp(buf, "begin ", 6) == 0)
        !            66:                        break;
        !            67:        }
        !            68:        (void)sscanf(buf, "begin %o %s", &mode, dest);
        !            69: 
        !            70:        /* handle ~user/file format */
        !            71:        if (dest[0] == '~') {
        !            72:                char *sl;
        !            73:                struct passwd *getpwnam();
        !            74:                struct passwd *user;
        !            75:                char dnbuf[100], *index(), *strcat(), *strcpy();
        !            76: 
        !            77:                sl = index(dest, '/');
        !            78:                if (sl == NULL) {
        !            79:                        fprintf(stderr, "Illegal ~user\n");
        !            80:                        exit(3);
        !            81:                }
        !            82:                *sl++ = 0;
        !            83:                user = getpwnam(dest+1);
        !            84:                if (user == NULL) {
        !            85:                        fprintf(stderr, "No such user as %s\n", dest);
        !            86:                        exit(4);
        !            87:                }
        !            88:                strcpy(dnbuf, user->pw_dir);
        !            89:                strcat(dnbuf, "/");
        !            90:                strcat(dnbuf, sl);
        !            91:                strcpy(dest, dnbuf);
        !            92:        }
        !            93: 
        !            94:        /* create output file */
        !            95:        out = fopen(dest, "w");
        !            96:        if (out == NULL) {
        !            97:                perror(dest);
        !            98:                exit(4);
        !            99:        }
        !           100:        chmod(dest, mode);
        !           101: 
        !           102:        decode(in, out);
        !           103: 
        !           104:        if (fgets(buf, sizeof buf, in) == NULL || strcmp(buf, "end\n")) {
        !           105:                fprintf(stderr, "No end line\n");
        !           106:                exit(5);
        !           107:        }
        !           108:        exit(0);
        !           109: }
        !           110: 
        !           111: /*
        !           112:  * copy from in to out, decoding as you go along.
        !           113:  */
        !           114: decode(in, out)
        !           115: FILE *in;
        !           116: FILE *out;
        !           117: {
        !           118:        char buf[80];
        !           119:        char *bp;
        !           120:        int n;
        !           121: 
        !           122:        for (;;) {
        !           123:                /* for each input line */
        !           124:                if (fgets(buf, sizeof buf, in) == NULL) {
        !           125:                        printf("Short file\n");
        !           126:                        exit(10);
        !           127:                }
        !           128:                n = DEC(buf[0]);
        !           129:                if (n <= 0)
        !           130:                        break;
        !           131: 
        !           132:                bp = &buf[1];
        !           133:                while (n > 0) {
        !           134:                        outdec(bp, out, n);
        !           135:                        bp += 4;
        !           136:                        n -= 3;
        !           137:                }
        !           138:        }
        !           139: }
        !           140: 
        !           141: /*
        !           142:  * output a group of 3 bytes (4 input characters).
        !           143:  * the input chars are pointed to by p, they are to
        !           144:  * be output to file f.  n is used to tell us not to
        !           145:  * output all of them at the end of the file.
        !           146:  */
        !           147: outdec(p, f, n)
        !           148: char *p;
        !           149: FILE *f;
        !           150: {
        !           151:        int c1, c2, c3;
        !           152: 
        !           153:        c1 = DEC(*p) << 2 | DEC(p[1]) >> 4;
        !           154:        c2 = DEC(p[1]) << 4 | DEC(p[2]) >> 2;
        !           155:        c3 = DEC(p[2]) << 6 | DEC(p[3]);
        !           156:        if (n >= 1)
        !           157:                putc(c1, f);
        !           158:        if (n >= 2)
        !           159:                putc(c2, f);
        !           160:        if (n >= 3)
        !           161:                putc(c3, f);
        !           162: }

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