sbase/paste.c

236 lines
3.5 KiB
C

/* See LICENSE file for copyright and license details. */
#include <locale.h>
#include <stdbool.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <wchar.h>
#include "util.h"
typedef struct {
FILE *fp;
const char *name;
} Fdescr;
static size_t unescape(wchar_t *);
static wint_t in(Fdescr *);
static void out(wchar_t);
static void sequential(Fdescr *, int, const wchar_t *, size_t);
static void parallel(Fdescr *, int, const wchar_t *, size_t);
static void
usage(void)
{
eprintf("usage: %s [-s] [-d list] file...\n", argv0);
}
int
main(int argc, char *argv[])
{
const char *adelim = NULL;
bool seq = false;
wchar_t *delim;
size_t len;
Fdescr *dsc;
int i;
setlocale(LC_CTYPE, "");
ARGBEGIN {
case 's':
seq = true;
break;
case 'd':
adelim = EARGF(usage());
break;
default:
usage();
} ARGEND;
if(argc == 0)
usage();
/* populate delimeters */
if(!adelim)
adelim = "\t";
len = mbstowcs(NULL, adelim, 0);
if(len == (size_t)-1)
eprintf("invalid delimiter\n");
delim = malloc((len + 1) * sizeof(*delim));
if(!delim)
eprintf("out of memory\n");
mbstowcs(delim, adelim, len);
len = unescape(delim);
if(len == 0)
eprintf("no delimiters specified\n");
/* populate file list */
dsc = malloc(argc * sizeof(*dsc));
if(!dsc)
eprintf("out of memory\n");
for(i = 0; i < argc; i++) {
const char *name = argv[i];
if(strcmp(name, "-") == 0)
dsc[i].fp = stdin;
else
dsc[i].fp = fopen(name, "r");
if(!dsc[i].fp)
eprintf("can't open '%s':", name);
dsc[i].name = name;
}
if(seq)
sequential(dsc, argc, delim, len);
else
parallel(dsc, argc, delim, len);
for(i = 0; i < argc; i++) {
if(dsc[i].fp != stdin)
(void)fclose(dsc[i].fp);
}
free(delim);
free(dsc);
return 0;
}
static size_t
unescape(wchar_t *delim)
{
wchar_t c;
size_t i;
size_t len;
for(i = 0, len = 0; (c = delim[i++]) != '\0'; len++) {
if(c == '\\') {
switch(delim[i++]) {
case 'n':
delim[len] = '\n';
break;
case 't':
delim[len] = '\t';
break;
case '0':
delim[len] = '\0';
break;
case '\\':
delim[len] = '\\';
break;
case '\0':
default:
/* POSIX: unspecified results */
return len;
}
} else
delim[len] = c;
}
return len;
}
static wint_t
in(Fdescr *f)
{
wint_t c = fgetwc(f->fp);
if(c == WEOF && ferror(f->fp))
eprintf("'%s' read error:", f->name);
return c;
}
static void
out(wchar_t c)
{
putwchar(c);
if(ferror(stdout))
eprintf("write error:");
}
static void
sequential(Fdescr *dsc, int len, const wchar_t *delim, size_t cnt)
{
int i;
for(i = 0; i < len; i++) {
size_t d = 0;
wint_t c, last = WEOF;
while((c = in(&dsc[i])) != WEOF) {
if(last == '\n') {
if(delim[d] != '\0')
out(delim[d]);
d++;
d %= cnt;
}
if(c != '\n')
out((wchar_t)c);
last = c;
}
if(last == '\n')
out((wchar_t)last);
}
}
static void
parallel(Fdescr *dsc, int len, const wchar_t *delim, size_t cnt)
{
int last;
do {
int i;
last = 0;
for(i = 0; i < len; i++) {
wint_t c;
wchar_t d = delim[i % cnt];
do {
wint_t o = in(&dsc[i]);
c = o;
switch(c) {
case WEOF:
if(last == 0)
break;
o = '\n';
/* fallthrough */
case '\n':
if(i != len - 1)
o = d;
break;
default:
break;
}
if(o != WEOF) {
/* pad with delimiters up to this point */
while(++last < i) {
if(d != '\0')
out(d);
}
out((wchar_t)o);
}
} while(c != '\n' && c != WEOF);
}
} while(last > 0);
}