77 lines
1.5 KiB
C
Executable file
77 lines
1.5 KiB
C
Executable file
#define _POSIX_C_SOURCE 200809L
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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int main(int argc, char *argv[]) {
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FILE * current_input_file;
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int i; char c;
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int using_unbuffered_output;
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int error_occurred;
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for(i = 1; i < argc; i++) {
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if(argv[i][0] == '-') {
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if(argv[i][1] == 'u') {
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using_unbuffered_output = 1;
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i = argc;
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}
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}
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}
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if(argc == 1) {
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current_input_file = stdin;
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for(c = fgetc(current_input_file); c != EOF;
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c = fgetc(current_input_file)) {
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if(using_unbuffered_output) {
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write(1, &c, 1);
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}
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else {
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fprintf(stdout, "%c", c);
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}
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}
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fclose(current_input_file);
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}
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for(i = 1; i < argc; i++) {
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if(argv[i][0] == '-' && argv[i][1] == '\0') {
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current_input_file = stdin;
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}
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else if(argv[i][0] == '-' && argv[i][1] == 'u' &&
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argv[i][2] == '\0') {
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if(argc > 2) {
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continue;
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}
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else {
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current_input_file = stdin;
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}
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}
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else {
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current_input_file = fopen(argv[i], "r");
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if(current_input_file == NULL) {
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fprintf(stderr, "%s: %s: No such file or directory\n",
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argv[0], argv[i]);
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error_occurred = 1;
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}
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}
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for(c = fgetc(current_input_file); c != EOF;
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c = fgetc(current_input_file)) {
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if(using_unbuffered_output) {
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write(1, &c, 1);
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}
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else {
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fprintf(stdout, "%c", c);
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}
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}
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fclose(current_input_file);
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}
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if(error_occurred) {
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return 1;
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}
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else {
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return 0;
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}
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}
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