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#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "util/versie.h"
#include "io/read_file.h"
static void usage(FILE *f) {
fprintf(f,
"Gebruik: tak [-hV] <bestand...>\n"
"\n"
"Schakel bestanden aaneen naar standaard uitvoer omgekeerd.\n"
"\n"
" -h Toon deze hulptekst\n"
" -V Toon versienummer\n");
}
// Returns pointer to argument array containing the file names
static char** parse_options(int argc, char **argv) {
int opt;
while ((opt = getopt(argc, argv, "hV")) != -1) {
switch (opt) {
case 'h':
usage(stdout);
exit(0);
case 'V':
drukkedoos_print_versie(stdout);
exit(0);
case '?':
fprintf(stderr, "tak: Ongeldige optie: -%c\n", optopt);
usage(stderr);
exit(1);
}
}
return argv + optind;
}
static void process(struct filebuf *fb) {
char *lstart, *lend;
lend = &fb->buf[fb->sz - 1];
while (lend > fb->buf) {
if (*lend == '\n') {
lend--;
}
lstart = lend;
while (*lstart != '\n' && lstart != fb->buf) {
lstart--;
}
if (lstart != fb->buf) {
lstart++;
}
fwrite(lstart, 1, lend - lstart + 2, stdout);
lend = lstart-1;
}
free_filebuf(fb);
}
int entry_tak(int argc, char **argv) {
char **args = parse_options(argc, argv);
if (*args == NULL) {
struct filebuf *fb = stream_to_filebuf(stdin, 0);
if (fb == NULL) goto err_stdin;
process(fb);
return 0;
}
while (*args != NULL) {
struct filebuf *fb = NULL;
if (!strcmp(*args, "-")) {
fb = stream_to_filebuf(stdin, 0);
if (fb == NULL) goto err_stdin;
} else {
bool isdir = false;
fb = file_to_filebuf(*args, 0, &isdir);
if (isdir) goto err_isdir;
else if (fb == NULL) goto err_file;
}
process(fb);
args++;
}
return 0;
err_stdin:
fprintf(stderr, "tak: fout bij lezen van standaard invoer\n");
return 1;
err_file:
fprintf(stderr, "tak: fout bij lezen van bestand\n");
return 1;
err_isdir:
fprintf(stderr, "tak: bestand '%s' is een mapje\n", *args);
return 1;
}
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