81 lines
1.6 KiB
C
81 lines
1.6 KiB
C
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#include "../command.h"
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#include <stdio.h>
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#include <string.h>
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#include <sys/stat.h>
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static void tail_file(FILE* file) {
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char* ring[10];
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memset(ring, 0, sizeof(char*) * 10);
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int ring_len[10];
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int index = 0;
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int size = 0;
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int read;
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size_t len = 0;
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char* line = NULL;
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while ((read = getline(&line, &len, file)) != -1) {
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if (ring[index] != NULL) free(ring[index]);
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ring[index] = line;
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ring_len[index] = read;
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index++;
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index %= 10;
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if (size < 10) size++;
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line = NULL;
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}
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index += 10 - size;
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index %= 10;
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for (int i = 0; i < size; i++) {
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fwrite(ring[index], ring_len[index], 1, stdout);
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free(ring[index]);
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index += 1;
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index %= 10;
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}
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free(line);
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fclose(file);
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}
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static void help() {
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printf("Usage: tail [FILE]...\n\n");
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printf("Print last 10 lines of FILEs (or stdin) to.\n");
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printf("With more than one FILE, precede each with a filename header.\n");
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exit(EXIT_SUCCESS);
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}
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COMMAND(tail) {
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if (argc < 1) {
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tail_file(stdin);
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return EXIT_SUCCESS;
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}
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if (streql(argv[0], "--help")) help();
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if (argc == 1) {
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FILE* file = get_file(argv[0], "r");
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tail_file(file);
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return EXIT_SUCCESS;
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}
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for (int i = 0; i < argc; i++) {
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FILE* file;
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if (streql("-", argv[i])) {
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file = stdin;
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} else {
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file = get_file_s(argv[i], "r");
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if (file == NULL) continue;
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}
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printf("\n==> %s <==\n", argv[i]);
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tail_file(file);
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}
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return EXIT_SUCCESS;
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}
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