71 lines
1.1 KiB
C
71 lines
1.1 KiB
C
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#include <assert.h>
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#include <errno.h>
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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char *cmnd;
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static void usage(void) {
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fprintf(stderr, "Usage: %s [-d delay] file ...\n", cmnd);
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exit(1);
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}
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static void do_cat(FILE *fp, double delay) {
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int c;
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while ((c = getc(fp)) != EOF) {
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putchar(c);
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usleep(delay * 1E6);
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}
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}
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int main(int argc, char **argv) {
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int rc = 0;
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int c;
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double delay = 0.5;
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cmnd = argv[0];
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while ((c = getopt(argc, argv, "d:")) != EOF) {
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char *p;
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switch (c) {
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case 'd':
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p = NULL;
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delay = strtod(optarg, &p);
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if (!p || *p) usage();
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if (delay < 0 || delay > ULONG_MAX / 1E6) usage();
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break;
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case '?':
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usage();
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default:
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assert(0);
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}
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}
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setvbuf(stdout, NULL, _IONBF, 0);
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if (optind == argc) {
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do_cat(stdin, delay);
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} else {
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int i;
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for (i = optind; i < argc; i++) {
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FILE *fp = fopen(argv[i], "r");
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if (fp) {
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do_cat(fp, delay);
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fclose(fp);
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} else {
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fprintf(stderr, "%s: cannot open %s for reading: %s\n",
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argv[0], argv[i], strerror(errno));
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rc++;
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}
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}
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}
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return rc;
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}
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