sbase/tr.c

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/* See LICENSE file for copyright and license details. */
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <locale.h>
#include <wchar.h>
#include "text.h"
#include "util.h"
static void
usage(void)
{
eprintf("usage: %s set1 [set2]\n", argv0);
}
void
handleescapes(char *s)
{
switch(*s) {
case 'n':
*s = '\n';
break;
case 't':
*s = '\t';
break;
case '\\':
*s = '\\';
break;
case 'r':
*s = '\r';
break;
case 'f':
*s = '\f';
break;
case 'a':
*s = '\a';
break;
case 'b':
*s = '\b';
break;
case 'v':
*s = '\v';
break;
}
}
void
parsemapping(const char *set1, const char *set2, wchar_t *mappings)
{
char *s;
wchar_t runeleft;
wchar_t runeright;
int leftbytes;
int rightbytes;
size_t n = 0;
size_t lset2;
if(set2) {
lset2 = strnlen(set2, 255 * sizeof(wchar_t));
} else {
set2 = &set1[0];
lset2 = 0;
}
s = (char *)set1;
while(*s) {
if(*s == '\\')
handleescapes(++s);
leftbytes = mbtowc(&runeleft, s, 4);
if(set2[n] != '\0')
rightbytes = mbtowc(&runeright, set2 + n, 4);
mappings[runeleft] = runeright;
s += leftbytes;
if(n < lset2)
n += rightbytes;
}
}
void
maptonull(const wchar_t *mappings, char *in)
{
const char *s;
wchar_t runeleft;
int leftbytes = 0;
s = in;
while(*s) {
leftbytes = mbtowc(&runeleft, s, 4);
if(!mappings[runeleft])
putwchar(runeleft);
s += leftbytes;
}
}
void
maptoset(const wchar_t *mappings, char *in)
{
const char *s;
wchar_t runeleft;
int leftbytes = 0;
s = in;
while(*s) {
leftbytes = mbtowc(&runeleft, s, 4);
if(!mappings[runeleft])
putwchar(runeleft);
else
putwchar(mappings[runeleft]);
s += leftbytes;
}
}
int
main(int argc, char *argv[])
{
wchar_t *mappings;
char *buf = NULL;
size_t size = 0;
void (*mapfunc)(const wchar_t*, char*);
setlocale(LC_ALL, "");
mappings = (wchar_t *)mmap(NULL, 0x110000 * sizeof(wchar_t),
PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, -1, 0);
if (mappings == MAP_FAILED)
eprintf("mmap:");
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ARGBEGIN {
default:
usage();
} ARGEND;
if(argc == 0)
usage();
if(argc >= 2) {
parsemapping(argv[0], argv[1], mappings);
mapfunc = maptoset;
} else {
parsemapping(argv[0], NULL, mappings);
mapfunc = maptonull;
}
while(afgets(&buf, &size, stdin))
mapfunc(mappings, buf);
free(buf);
if(ferror(stdin))
eprintf("<stdin>: read error:");
munmap(mappings, 0x110000 * sizeof(wchar_t));
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return EXIT_SUCCESS;
}