83 lines
1.7 KiB
C
83 lines
1.7 KiB
C
#include "command.h"
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#include "lslib.h"
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#include <signal.h>
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#include <stdlib.h>
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static struct {
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bool append;
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bool handle_sigint;
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} flags;
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static void help(void) {
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printf("Usage: tee [-ai] [FILE]...\n\n");
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printf("Copy stdin to each FILE, and also to stdout\n\n");
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printf("\t-a Append to the given FILEs, don't overwrite\n");
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printf("\t-i Ignore interrupt signals (SIGINT)\n");
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exit(EXIT_SUCCESS);
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}
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static void handle(int dummy){UNUSED(dummy);}
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static void run_tee(int file_count, FILE** files) {
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char c;
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int i;
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while((c = getchar()) != EOF) {
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int i;
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for (i = 0; i < file_count; i++) {
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fwrite(&c, 1, 1, files[i]);
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fflush(files[i]);
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}
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putchar(c);
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}
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for (i = 0; i < file_count; i++) {
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fclose(files[i]);
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}
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}
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static int short_arg(char c, char* next) {
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UNUSED(next);
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switch (c) {
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case 'a':
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flags.append = true;
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break;
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case 'i':
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flags.handle_sigint = true;
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break;
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default:
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return ARG_INVALID;
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}
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return ARG_UNUSED;
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}
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COMMAND(tee) {
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int start, i;
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FILE** files;
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flags.append = false;
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flags.handle_sigint = false;
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start = parse_args(argc, argv, help, short_arg, NULL);
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if (flags.handle_sigint) {
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signal(SIGINT, handle);
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}
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if (argc - start < 1) {
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run_tee(0, NULL);
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return EXIT_SUCCESS;
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}
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files = malloc(sizeof(FILE*) * (argc - start));
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for (i = start; i < argc; i++) {
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FILE* file = get_file(argv[i], flags.append ? "a" : "w");
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files[i - start] = file;
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}
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run_tee(argc - start, files);
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return EXIT_SUCCESS;
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}
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