70 lines
1.4 KiB
C
70 lines
1.4 KiB
C
#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#include <unistd.h>
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#define BUF_SIZE 1024
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void print_now() {
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time_t now;
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time(&now);
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struct tm *time_parts = localtime(&now);
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if (!time_parts) {
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perror("Error getting time");
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exit(3);
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}
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printf("[%d-%02d-%02d %02d:%02d:%02d] ",
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time_parts->tm_year + 1900,
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time_parts->tm_mon + 1,
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time_parts->tm_mday,
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time_parts->tm_hour,
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time_parts->tm_min,
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time_parts->tm_sec);
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}
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/**
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* Program that reads from STDIN and writes to STDOUT with each line annotated
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* with the current date and time
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*/
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int main() {
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char buffer[BUF_SIZE];
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// when true, print the time on the next iteration
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// allows us to avoid printing after the last newline
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bool output_time = true;
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ssize_t count_read;
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while ((count_read = read(STDIN_FILENO, buffer, BUF_SIZE))) {
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for (ssize_t i=0; i < count_read; i++) {
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if (output_time && !feof(stdin)) {
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print_now();
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output_time = false;
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}
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if (buffer[i] == '\n') {
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printf("\n");
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if (fflush(stdout) == EOF) {
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perror("Unable to flush stdout");
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exit(2);
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}
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output_time = true;
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} else {
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fputc(buffer[i], stdout);
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}
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}
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}
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if (count_read < 0) {
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perror("Error reading from stdin");
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exit(1);
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}
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fflush(stdout);
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return 0;
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}
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