diff options
| -rw-r--r-- | simpletail.c | 23 |
1 files changed, 20 insertions, 3 deletions
diff --git a/simpletail.c b/simpletail.c index b71339f..5201406 100644 --- a/simpletail.c +++ b/simpletail.c @@ -38,13 +38,24 @@ #define BUFFER_SIZE 4096 #define DEFAULT_N_LINES 10 -void usage(void) +/* Print header with filename before tailing the file? */ +static short verbose = 0; + +static void usage(void) { fprintf(stderr, "usage: simpletail [-f] [-n <nr-lines>] <file>\n"); exit(EXIT_FAILURE); } -off_t lines(int fd, int file_size, unsigned int n_lines) +static void write_header(const char *filename) +{ + static unsigned short first_file = 1; + + fprintf (stdout, "%s==> %s <==\n", (first_file ? "" : "\n"), filename); + first_file = 0; +} + +static off_t lines(int fd, int file_size, unsigned int n_lines) { int i; char buf[BUFFER_SIZE]; @@ -89,7 +100,7 @@ off_t lines(int fd, int file_size, unsigned int n_lines) return offset; } -int watch_file(const char *filename, off_t offset) +static int watch_file(const char *filename, off_t offset) { int ifd, watch; struct inotify_event *inev; @@ -183,6 +194,9 @@ int main(int argc, char **argv) case 'n': n_lines = strtol(argv[++i], NULL, 0); break; + case 'v': + verbose = 1; + break; default: usage(); break; @@ -205,6 +219,9 @@ int main(int argc, char **argv) offset = lines(fd, finfo.st_size, n_lines); dprintf(" offset: %lu.\n", offset); + if (verbose) + write_header(filename); + lseek(fd, offset, SEEK_SET); while (read(fd, &buf, BUFFER_SIZE) != 0) { write(STDOUT_FILENO, buf, finfo.st_size - offset); |