auravulpes/FENIX_coreutils
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formatting changes, using getopt() now

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Gitea 2020-12-13 09:25:50 -06:00
parent 74b0ebb9ca
commit 40b8855cda
1 changed files with 20 additions and 35 deletions
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55
cat.c
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@ -5,67 +5,52 @@
#include <unistd.h> #include <unistd.h>
int main(int argc, char *argv[]) { int main(int argc, char *argv[]) {
FILE * current_input_file; FILE * cur_in_file;
int i; char c; int i; char c;
int using_unbuffered_output; int using_unbuffered_output;
int error_occurred; int error_occurred;
for(i = 1; i < argc; i++) { while((c = getopt(argc, argv, "u")) != -1) {
if(argv[i][0] == '-') { if(c == 'u') {
if(argv[i][1] == 'u') { using_unbuffered_output = 1;
using_unbuffered_output = 1;
i = argc;
}
} }
} }
if(argc == 1) { if(argc == 1 || optind == argc) {
current_input_file = stdin; cur_in_file = stdin;
for(c = fgetc(current_input_file); c != EOF; for(c = fgetc(cur_in_file); c != EOF; c = fgetc(cur_in_file)) {
c = fgetc(current_input_file)) {
if(using_unbuffered_output) { if(using_unbuffered_output) {
write(1, &c, 1); write(1, &c, 1);
} }
else { else {
fprintf(stdout, "%c", c); fprintf(stdout, "%c", c);
} }
} }
fclose(current_input_file); fclose(cur_in_file);
} }
for(i = 1; i < argc; i++) { for(i = optind; i < argc; i++) {
if(argv[i][0] == '-' && argv[i][1] == '\0') { if(argv[i][0] == '-' && argv[i][1] == '\0') {
current_input_file = stdin; cur_in_file = stdin;
}
else if(argv[i][0] == '-' && argv[i][1] == 'u' &&
argv[i][2] == '\0') {
if(argc > 2) {
continue;
}
else {
current_input_file = stdin;
}
} }
else { else {
current_input_file = fopen(argv[i], "r"); cur_in_file = fopen(argv[i], "r");
if(current_input_file == NULL) { if(cur_in_file == NULL) {
fprintf(stderr, "%s: %s: No such file or directory\n", fprintf(stderr, "%s: %s: No such file or directory\n", argv[0], argv[i]);
argv[0], argv[i]); error_occurred = 1;
error_occurred = 1;
} }
} }
for(c = fgetc(current_input_file); c != EOF; for(c = fgetc(cur_in_file); c != EOF; c = fgetc(cur_in_file)) {
c = fgetc(current_input_file)) {
if(using_unbuffered_output) { if(using_unbuffered_output) {
write(1, &c, 1); write(1, &c, 1);
} }
else { else {
fprintf(stdout, "%c", c); fprintf(stdout, "%c", c);
} }
} }
fclose(current_input_file); fclose(cur_in_file);
} }
if(error_occurred) { if(error_occurred) {