140 lines
3.2 KiB
C
140 lines
3.2 KiB
C
#include "../command.h"
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#include <ctype.h>
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static struct {
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bool number_lines;
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bool number_non_empty;
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bool change_non_print;
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bool change_tabs;
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bool end_lines_dollar;
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} flags;
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static bool printable(char c) {
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switch (c) {
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case '\n': return true;
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case '\r': return true;
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case '\b': return true;
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case '\t': return true;
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default: return isprint(c) == 0;
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}
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}
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static void help(void) {
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printf("Usage: cat [-nbvteA] [FILE]...\n\n");
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printf("Print FILEs to stdout\n\n");
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printf("\t-n Number output lines\n");
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printf("\t-b Number nonempty lines\n");
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printf("\t-v Show nonprinting characters as ^x or M-x\n");
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printf("\t-t ...and tabs as ^I\n");
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printf("\t-e ...and end lines with $\n");
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printf("\t-A Same as -vte\n");
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}
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static void cat_file(FILE* file) {
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char c;
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size_t read;
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size_t line = 1;
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bool empty = true;
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bool newline = true;
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while ((read = fread(&c, 1, 1, file)) != 0) {
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if (c == '\n') {
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if (empty && flags.number_lines) {
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printf("\t%ld ", line);
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}
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if (flags.end_lines_dollar) {
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printf("$");
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}
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line++;
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newline = true;
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empty = true;
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goto print;
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} else {
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empty = false;
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}
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if (!newline) {
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goto print;
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}
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if (!empty && (flags.number_non_empty || flags.number_lines)) {
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printf("\t%ld ", line);
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newline = false;
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}
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print:
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if (!flags.change_non_print || printable(c)) {
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if (flags.change_tabs && c == '\t') {
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fwrite("^I", 1, 2, stdout);
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} else {
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fwrite(&c, 1, 1, stdout);
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}
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} else {
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c |= '@';
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fwrite(&c, 1, 1, stdout);
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}
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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 'n':
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flags.number_lines = true;
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break;
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case 'b':
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flags.number_non_empty = true;
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break;
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case 'v':
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flags.change_non_print = true;
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break;
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case 't':
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flags.change_non_print = true;
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flags.change_tabs = true;
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break;
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case 'e':
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flags.change_non_print = true;
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flags.end_lines_dollar = true;
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break;
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case 'A':
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flags.change_non_print = true;
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flags.change_tabs = true;
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flags.end_lines_dollar = 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(cat) {
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int start;
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int arg_len;
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int i;
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flags.number_lines = false;
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flags.number_non_empty = false;
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flags.change_non_print = false;
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flags.change_tabs = false;
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flags.end_lines_dollar = false;
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start = parse_args(argc, argv, help, short_arg, NULL);
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arg_len = argc - start;
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if (arg_len < 1) {
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cat_file(stdin);
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return EXIT_SUCCESS;
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}
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for (i = start; i < argc; i++) {
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FILE* in = get_file(argv[i], "r");
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cat_file(in);
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if (in != stdin)
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fclose(in);
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}
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return EXIT_SUCCESS;
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}
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