/**
* @file debconf-escape.c
* @brief helper when working with debconf's escape capability
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <getopt.h>
static int escape = 0;
static int unescape = 0;
static struct option options[] = {
{ "help", 0, 0, 'h' },
{ "escape", 0, 0, 'e' },
{ "unescape", 0, 0, 'u' },
{ 0, 0, 0, 0 },
};
static void help(FILE *f, const char *exename)
{
fprintf(f, "Usage: %s -e|-u < input-text\n", exename);
fputs(" -e, --escape escape text\n"
" -u, --unescape unescape text\n"
"\n"
"Exactly one of -e or -u must be used.\n", f);
}
static void parsecmdline(int argc, char **argv)
{
int c;
while ((c = getopt_long(argc, argv, "euh", options, NULL)) >= 0)
{
switch (c)
{
case 'h':
help(stdout, argv[0]);
exit(0);
break;
case 'e':
escape = 1;
break;
case 'u':
unescape = 1;
break;
default:
break;
}
}
if (optind > argc || escape == unescape)
{
help(stderr, argv[0]);
exit(1);
}
}
int main(int argc, char **argv)
{
char buf[1024];
const char *p;
size_t r;
parsecmdline(argc, argv);
if (escape)
{
while (!feof(stdin) && !ferror(stdin))
{
r = fread(buf, sizeof(*buf), 1024, stdin);
for (p = buf; p < buf + r; ++p)
{
switch (*p)
{
case '\\':
fputs("\\\\", stdout);
break;
case '\n':
fputs("\\n", stdout);
break;
default:
fputc(*p, stdout);
break;
}
}
}
}
else
{
int unesc = 0;
while (!feof(stdin) && !ferror(stdin))
{
r = fread(buf, sizeof(*buf), 1024, stdin);
for (p = buf; p < buf + r; ++p)
{
if (unesc)
{
switch (*p)
{
case 'n':
fputc('\n', stdout);
break;
default:
fputc(*p, stdout);
break;
}
unesc = 0;
}
else if (*p == '\\')
unesc = 1;
else
fputc(*p, stdout);
}
}
}
if (ferror(stdin))
{
fprintf(stderr, "%s: error reading stdin\n", argv[0]);
return 1;
}
return 0;
}