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Annotation of coherent/g/usr/bin/gzip/zread.c, revision 1.1

1.1     ! root        1: #include <stdio.h>
        !             2: 
        !             3: /* Trivial example of reading a gzip'ed file or gzip'ed standard input
        !             4:  * using stdio functions fread(), getc(), etc... fseek() is not supported.
        !             5:  * Modify according to your needs. You can easily construct the symmetric
        !             6:  * zwrite program.
        !             7:  *
        !             8:  * Usage: zread [file[.z]]
        !             9:  * This programs assumes that gzip is somewhere in your path.
        !            10:  */
        !            11: int main(argc, argv)
        !            12:     int argc;
        !            13:     char **argv;
        !            14: {
        !            15:     FILE *infile;
        !            16:     char cmd[256];
        !            17:     char buf[BUFSIZ];
        !            18:     int n;
        !            19: 
        !            20:     if (argc < 1 || argc > 2) {
        !            21:        fprintf(stderr, "usage: %s [file[.z]]\n", argv[0]);
        !            22:        exit(1);
        !            23:     }
        !            24:     strcpy(cmd, "gzip -dc ");  /* use "gzip -c" for zwrite */
        !            25:     if (argc == 2) {
        !            26:        strncat(cmd, argv[1], sizeof(cmd)-strlen(cmd));
        !            27:     }
        !            28:     infile = popen(cmd, "r");  /* use "w" for zwrite */
        !            29:     if (infile == NULL) {
        !            30:        fprintf(stderr, "%s: popen('%s', 'r') failed\n", argv[0], cmd);
        !            31:        exit(1);
        !            32:     }
        !            33:     /* Read one byte using getc: */
        !            34:     n = getc(infile);
        !            35:     if (n == EOF) {
        !            36:        pclose(infile);
        !            37:        exit(0);
        !            38:     }
        !            39:     putchar(n);
        !            40: 
        !            41:     /* Read the rest using fread: */
        !            42:     for (;;) {
        !            43:        n = fread(buf, 1, BUFSIZ, infile);
        !            44:        if (n <= 0) break;
        !            45:        fwrite(buf, 1, n, stdout);
        !            46:     }
        !            47:     if (pclose(infile) != 0) {
        !            48:        fprintf(stderr, "%s: pclose failed\n", argv[0]);
        !            49:        exit(1);
        !            50:     }
        !            51:     exit(0);
        !            52:     return 0; /* just to make compiler happy */
        !            53: }

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