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#include <assert.h>
#include <errno.h>
#include <getopt.h>
#include <pwd.h>
#include <stdlib.h>
#include <string.h>
#include <sys/random.h>
#include <sys/types.h>
#include <unistd.h>
#include "util/debug.h"
#include "util/error.h"
#include "util/versie.h"
static char *shufrange = NULL;
static char **lines = NULL;
static size_t nlines = 0;
static void shuf_lines() {
size_t *js = calloc(nlines, sizeof(size_t));
errno = 0;
if (getrandom(js, nlines*sizeof(size_t), 0) == -1) exit(1);
for (ssize_t i = nlines - 1; i > 0; i--) {
size_t j = js[i] % (nlines-1);
char *x = lines[i];
lines[i] = lines[j];
lines[j] = x;
}
free(js);
}
static void usage(FILE *f) {
fprintf(f,
"Gebruik: hus [-hV] [BESTAND]\n"
" hus -i LA-HO [-hV]\n"
"\n"
"Hussel de regels van het gegeven bestand.\n"
"Als er geen bestand gegeven is, of bestand is -, hussel dan de regels op standaard invoer.\n"
"\n"
" -i LA-HO Genereer regels van laag naar hoog en hussel deze\n"
" -h Toon deze hulptekst\n"
" -V Toon versienummer\n");
}
static char** parse_options(int argc, char **argv) {
int opt;
while ((opt = getopt(argc, argv, "i:hV")) != -1) {
switch (opt) {
case 'i':
shufrange = optarg;
break;
case 'h':
usage(stdout);
exit(0);
case 'V':
drukkedoos_print_versie(stdout);
exit(0);
case '?':
fprintf(stderr, "hus: Ongeldige optie: -%c\n", optopt);
usage(stderr);
exit(1);
}
}
return argv + optind;
}
static int exec_shufrange() {
assert(shufrange != NULL);
char *seploc = NULL;
if ((seploc = strchr(shufrange, '-')) != NULL) {
*seploc = '\0';
const long long start = strtoll(shufrange, NULL, 10);
const long long end = strtoll(seploc+1, NULL, 10);
if (start > end) {
fprintf(stderr, "hus: HO groter dan LA\n");
return 1;
}
nlines = end - start + 1;
lines = calloc(nlines, sizeof(char*));
for (long long i = 0; i <= start+end; i++) {
long long n = i + start;
asprintf(lines + i, "%lld", n);
}
} else {
fprintf(stderr, "hus: geen LA en HO waarde opgegeven\n");
return 1;
}
return 0;
}
static int exec_shufstream(FILE *restrict stream) {
size_t cap = 1 << 8;
lines = malloc(sizeof(char*)*cap);
char *line = NULL;
size_t linen = 0;
ssize_t nread = 0;
while ((errno = 0, nread = getline(&line, &linen, stream)) != -1) {
if (nread > 0 && line[nread-1] == '\n') line[--nread] = '\0';
if (nlines == cap) {
cap *= 2;
lines = realloc(lines, sizeof(char*)*cap);
}
lines[nlines] = strdup(line);
nlines++;
}
free(line);
return 0;
}
int entry_hus(int argc, char **argv) {
int res;
#define CHECK(f) if ((res = f) != 0) return res;
char **args = parse_options(argc, argv);
// count the amount of arguments provided
size_t nargs;
for (nargs = 0; args[nargs] != NULL; nargs++);
if (shufrange) {
CHECK(exec_shufrange());
} else if (nargs == 0 || (nargs == 1 && strcmp(args[0], "-") == 0)) {
CHECK(exec_shufstream(stdin));
} else if (nargs == 1) {
FILE *stream = fopen(args[0], "r");
if (stream == NULL) {
fprintf(stderr, "hus: %s: kon bestand niet openen\n", args[0]);
return 1;
}
CHECK(exec_shufstream(stream));
fclose(stream);
} else {
fprintf(stderr, "hus: teveel argumenten gegeven\n");
return 1;
}
shuf_lines();
for (size_t i = 0; i < nlines; i++) {
printf("%s\n", lines[i]);
}
return 0;
}
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