51 lines
1.0 KiB
C
51 lines
1.0 KiB
C
#include <stdbool.h>
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#include <stdio.h>
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#include <signal.h>
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#include <unistd.h>
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int usage(char *argv0) {
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printf("Usage: %s [-ai] [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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int opt;
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bool append = false;
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bool iflag = false;
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while ((opt = getopt(argc, argv, ":ai")) != -1) {
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switch (opt) {
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case 'a':
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append = true;
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break;
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case 'i':
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iflag = true;
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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 (iflag && signal(SIGINT, SIG_IGN) == SIG_ERR) {} // FIXME
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int arg = optind;
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void *buf[BUFSIZ];
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FILE *file;
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ssize_t n;
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while ((n = read(0, buf, sizeof(buf))) > 0) {
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optind = arg;
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if (optind < argc) {
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for (; optind < argc; optind++) {
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file = fopen(argv[optind], append ? "w" : "a+");
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fwrite(buf, BUFSIZ, 1, file);
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fclose(file);
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append = true;
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}
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} else {
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fwrite(buf, BUFSIZ, 1, stdout);
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}
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}
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return 0;
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}
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