89 lines
1.8 KiB
C
89 lines
1.8 KiB
C
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/* vim: tabstop=4 shiftwidth=4 noexpandtab
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* This file is part of ToaruOS and is released under the terms
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* of the NCSA / University of Illinois License - see LICENSE.md
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* Copyright (C) 2018 K. Lange
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*
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* strings - print printable character sequences found in a file
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*/
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#include <stdio.h>
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#include <string.h>
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#include <getopt.h>
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#include <ctype.h>
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#include <unistd.h>
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#include <errno.h>
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int main(int argc, char * argv[]) {
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int opt;
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char format = 0;
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int min_chars = 4;
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int ret_val = 0;
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while ((opt = getopt(argc, argv, "an:t:")) != -1) {
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switch (opt) {
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case 'a':
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/* TODO: With ELF support, read only the string table
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* by default, unless this option is specified. */
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break;
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case 'n':
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min_chars = atoi(optarg);
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break;
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case 't':
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format = optarg[0];
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if (format != 'd' && format != 'x') {
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fprintf(stderr, "%s: format '%c' is not supported\n", argv[0], format);
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format = 0;
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}
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break;
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}
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}
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for (int i = optind; i < argc; ++i) {
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FILE * f = fopen(argv[i], "r");
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if (!f) {
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fprintf(stderr, "%s: %s: %s\n", argv[0], argv[i], strerror(errno));
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ret_val = 1;
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continue;
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}
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char buf[1024] = {0};
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int ind = 0;
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size_t offset = 0;
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while (!feof(f)) {
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int c = fgetc(f);
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if (c < 0) break;
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if (c == '\n' || c == '\0') {
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if (ind >= min_chars) {
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switch (format) {
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case 'x':
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fprintf(stdout, "%lx ", offset - ind);
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break;
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case 'd':
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fprintf(stdout, "%lu ", offset - ind);
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break;
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default:
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break;
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}
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buf[ind] = '\0';
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fprintf(stdout, "%s\n", buf);
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}
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ind = 0;
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offset++;
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continue;
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}
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if (!isprint(c)) {
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ind = 0;
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} else {
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if (ind < 1024) {
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buf[ind] = c;
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ind++;
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}
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}
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offset++;
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}
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fclose(f);
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}
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return ret_val;
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}
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