51 lines
1011 B
C
51 lines
1011 B
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <fcntl.h>
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#include <unistd.h>
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int usage(char *argv0) {
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printf("Usage: %s [-u] [file ...]\n", argv0);
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return 2;
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}
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int main(int argc, char *argv[]){
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char ch;
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int opt;
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FILE *file = stdin;
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while ((opt = getopt(argc, argv, ":u")) != -1) {
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switch (opt) {
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case 'u':
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break;
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case '?':
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fprintf(stderr, "%s: invalid option -- '%c'\n", argv[0], optopt);
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return usage(argv[0]);
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}
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}
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if (optind == argc) { // FIXME: this code is not clean
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goto READ_STDIN;
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}
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for (; optind < argc; optind++) {
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if (strcmp(argv[optind], "-")) {
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file = fopen(argv[optind], "r");
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if (file == NULL) {
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fprintf(stderr, "%s: ", argv[0]);
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perror(argv[optind]);
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return -1;
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}
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} else {
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file = stdin;
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}
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READ_STDIN:
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while ((ch = fgetc(file)) != EOF) {
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putchar(ch);
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}
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if (file != NULL && file != stdin) {
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fclose(file);
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}
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}
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return 0;
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}
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