73 lines
1.7 KiB
C
Executable File
73 lines
1.7 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 * cur_in_file;
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int i; char c;
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int using_unbuffered_output = 0;
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int error_occurred = 0;
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/*
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Check for -u and use unbuffered output if present
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*/
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while((c = getopt(argc, argv, "u")) != -1) {
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if(c == 'u') {
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using_unbuffered_output = 1;
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}
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}
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/*
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Set unbuffered output. We do this for both stdin and stdout, let setvbuf
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allocate the buffer (that we don't need), _IONBF tells it to not buffer,
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and we just say 15 character buffer because, well, eh, who cares?
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*/
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if(using_unbuffered_output) {
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setvbuf(stdin, NULL, _IONBF, 15);
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setvbuf(stdout, NULL, _IONBF, 15);
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}
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/*
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If no input files were given, just open up stdin
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*/
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if(argc == 1 || optind == argc) {
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cur_in_file = stdin;
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for(c = fgetc(cur_in_file); c != EOF; c = fgetc(cur_in_file)) {
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fprintf(stdout, "%c", c);
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}
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fclose(cur_in_file);
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}
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/*
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Open up each file given (or stdin if - was given), print it to stdout,
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then close it and move to the next while there are still files
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*/
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for(i = optind; i < argc; i++) {
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if(argv[i][0] == '-' && argv[i][1] == '\0') {
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cur_in_file = stdin;
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}
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else {
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cur_in_file = fopen(argv[i], "r");
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if(cur_in_file == NULL) {
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fprintf(stderr, "%s: %s: No such file or directory\n", 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(cur_in_file); c != EOF; c = fgetc(cur_in_file)) {
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fprintf(stdout, "%c", c);
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}
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fclose(cur_in_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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