#include <stdio.h>/* Trivial example of reading a gzip'ed file or gzip'ed standard input * using stdio functions fread(), getc(), etc... fseek() is not supported. * Modify according to your needs. You can easily construct the symmetric * zwrite program. * * Usage: zread [file[.gz]] * This programs assumes that gzip is somewhere in your path. */int main(argc, argv)    int argc;    char **argv;{    FILE *infile;    char cmd[256];    char buf[BUFSIZ];    int n;    if (argc < 1 || argc > 2) {	fprintf(stderr, "usage: %s [file[.gz]]\n", argv[0]);	exit(1);    }    strcpy(cmd, "gzip -dc ");  /* use "gzip -c" for zwrite */    if (argc == 2) {	strncat(cmd, argv[1], sizeof(cmd)-strlen(cmd));    }    infile = popen(cmd, "r");  /* use "w" for zwrite */    if (infile == NULL) {	fprintf(stderr, "%s: popen('%s', 'r') failed\n", argv[0], cmd);	exit(1);    }    /* Read one byte using getc: */    n = getc(infile);    if (n == EOF) {	pclose(infile);	exit(0);    }    putchar(n);    /* Read the rest using fread: */    for (;;) {	n = fread(buf, 1, BUFSIZ, infile);	if (n <= 0) break;	fwrite(buf, 1, n, stdout);    }    if (pclose(infile) != 0) {	fprintf(stderr, "%s: pclose failed\n", argv[0]);	exit(1);    }    exit(0);    return 0; /* just to make compiler happy */}