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#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <ctype.h>
#include <unistd.h>
#include "util/versie.h"
static void usage(FILE *f) {
fprintf(f,
"Gebruik: weerklank [-nehV] [touwtje]...\n"
"\n"
"Exporteer de touwtjes.\n"
"\n"
" -n Voeg geen nieuwe regel toe\n"
" -e Ontleed terugslagontsnappingen\n"
" -h Toon deze hulptekst\n"
" -V Toon versienummer\n");
}
struct options {
bool nonewline;
bool unescape;
};
// Returns pointer to argument array containing the file names
static char** parse_options(int argc, char **argv, struct options *opts) {
int opt;
while ((opt = getopt(argc, argv, "nehV")) != -1) {
switch (opt) {
case 'n':
opts->nonewline = true;
break;
case 'e':
opts->unescape = true;
break;
case 'h':
usage(stdout);
exit(0);
case 'V':
drukkedoos_print_versie(stdout, "weerklank");
exit(0);
case '?':
fprintf(stderr, "weerklank: Ongeldige optie: -%c\n", optopt);
usage(stderr);
exit(1);
}
}
return argv + optind;
}
static const char lowercase_escapes[] = "\a\b\0\0\e\f\0\0\0\0\0\0\0\n\0\0\0\r\0\t\0\v\0\0\0\0";
static int fromhexdigit(char c) {
if ('0' <= c && c <= '9') return c - '0';
if ('a' <= c && c <= 'f') return c - 'a' + 10;
if ('A' <= c && c <= 'F') return c - 'A' + 10;
return -1;
}
int entry_weerklank(int argc, char **argv) {
struct options opts = {0};
char **args = parse_options(argc, argv, &opts);
for (int i = 0; args[i]; i++) {
if (i != 0) putchar(' ');
if (!opts.unescape) fputs(args[i], stdout);
else for (int j = 0; args[i][j]; j++) {
if (args[i][j] != '\\') putchar(args[i][j]);
else if ('a' <= args[i][j+1] && args[i][j+1] <= 'z'
&& lowercase_escapes[args[i][j+1] - 'a'] != '\0') {
putchar(lowercase_escapes[args[i][j+1] - 'a']);
j++;
} else if (args[i][j+1] == '0') {
char n = 0;
int len = 0;
while (isdigit(args[i][j+1 + len+1]) && len < 3)
n = 8 * n + (args[i][j+1 + ++len] - '0');
putchar(n);
j += 1 + len;
} else if (args[i][j+1] == 'x') {
int n1, n2;
if ((n1 = fromhexdigit(args[i][j+2])) == -1) fputs("\\x", stdout);
else if ((n2 = fromhexdigit(args[i][j+3])) == -1) { putchar(n1); j += 2; }
else { putchar(16 * n1 + n2); j += 3; }
} else putchar('\\');
}
}
if (!opts.nonewline) putchar('\n');
return 0;
}
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