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#include <getopt.h>
#include <pwd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
#include "util/versie.h"
#include "util/error.h"
#include "util/debug.h"
#include "util/map.h"
static void usage(FILE *f) {
fprintf(f,
"Gebruik: hoofd [-nchV] [BESTAND]...\n"
"\n"
"Toon de eerste 10 regels van elk BESTAND naar standaard uitvoer\n"
"\n"
" -n AANTAL Aantal regels om weer te geven\n"
" -c AANTAL Aantal karakters om weer te geven\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 *n, int *c) {
int opt;
while ((opt = getopt(argc, argv, "n:c:hV")) != -1) {
switch (opt) {
case 'c':
*c = atoi(optarg);
*n = -1;
break;
case 'n':
*c = -1;
*n = atoi(optarg);
break;
case 'h':
usage(stdout);
exit(0);
case 'V':
drukkedoos_print_versie(stdout, "hoofd");
exit(0);
case '?':
usage(stderr);
exit(1);
}
}
return argv + optind;
}
int entry_hoofd(int argc, char **argv) {
int n = 10;
int c = -1;
char **args = parse_options(argc, argv, &n, &c);
while (*args != NULL) {
struct map *map = open_map(*args);
if (map == NULL) {
fprintf(stderr, "hoofd: fout bij lezen bestand");
return 1;
}
size_t i;
for (i = 0; i < (size_t)map->sb.st_size && (n > 0 || n == -1) && (c > 0 || c == -1); i++) {
if (map->addr[i] == '\n') {
if (n != -1) n--;
}
if (c != -1) c--;
}
fwrite(map->addr, 1, i, stdout);
args++;
}
return 0;
}
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