mirror of
git://git.suckless.org/sbase
synced 2024-12-22 23:13:44 +00:00
daad071b31
Signed-off-by: Hiltjo Posthuma <hiltjo@codemadness.org>
168 lines
3.0 KiB
C
168 lines
3.0 KiB
C
/* See LICENSE file for copyright and license details. */
|
|
#include <stdbool.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include "text.h"
|
|
#include "util.h"
|
|
|
|
static void
|
|
usage(void)
|
|
{
|
|
eprintf("usage: cut -b list [-n] [file...]\n"
|
|
" cut -c list [file...]\n"
|
|
" cut -f list [-d delim] [-s] [file...]\n");
|
|
}
|
|
|
|
typedef struct Range {
|
|
size_t min, max;
|
|
struct Range *next;
|
|
} Range;
|
|
|
|
static Range *list = NULL;
|
|
static char mode = 0;
|
|
static char delim = '\t';
|
|
static bool nflag = false;
|
|
static bool sflag = false;
|
|
|
|
static void
|
|
insert(Range *r)
|
|
{
|
|
Range *l, *p, *t;
|
|
|
|
for(p = NULL, l = list; l; p = l, l = l->next) {
|
|
if(r->max && r->max+1 < l->min) {
|
|
r->next = l;
|
|
break;
|
|
} else if(!l->max || r->min < l->max+2) {
|
|
l->min = MIN(r->min, l->min);
|
|
for(p = l, t = l->next; t; p = t, t = t->next)
|
|
if(r->max && r->max+1 < t->min) break;
|
|
l->max = (p->max && r->max) ? MAX(p->max, r->max) : 0;
|
|
l->next = t;
|
|
return;
|
|
}
|
|
}
|
|
if(p) p->next = r; else list = r;
|
|
}
|
|
|
|
static void
|
|
parselist(char *str)
|
|
{
|
|
char *s;
|
|
size_t n = 1;
|
|
Range *r;
|
|
|
|
for(s = str; *s; s++) {
|
|
if(*s == ' ') *s = ',';
|
|
if(*s == ',') n++;
|
|
}
|
|
if(!(r = malloc(n * sizeof(Range))))
|
|
eprintf("malloc:");
|
|
for(s = str; n; n--, s++) {
|
|
r->min = (*s == '-') ? 1 : strtoul(s, &s, 10);
|
|
r->max = (*s == '-') ? strtoul(s + 1, &s, 10) : r->min;
|
|
r->next = NULL;
|
|
if(!r->min || (r->max && r->max < r->min) || (*s && *s != ','))
|
|
eprintf("cut: bad list value\n");
|
|
insert(r++);
|
|
}
|
|
}
|
|
|
|
static size_t
|
|
seek(const char *s, size_t pos, size_t *prev, size_t count)
|
|
{
|
|
const char *t;
|
|
size_t n = pos - *prev;
|
|
|
|
if(mode == 'b') {
|
|
if((t = memchr(s, 0, n)))
|
|
return t - s;
|
|
if(nflag)
|
|
while(n && !UTF8_POINT(s[n])) n--;
|
|
*prev += n;
|
|
return n;
|
|
} else if(mode == 'c') {
|
|
for(n++, t = s; *t; t++)
|
|
if(UTF8_POINT(*t) && !--n) break;
|
|
} else {
|
|
for(t = (count < 2) ? s : s+1; n && *t; t++)
|
|
if(*t == delim && !--n && count) break;
|
|
}
|
|
*prev = pos;
|
|
return t - s;
|
|
}
|
|
|
|
static void
|
|
cut(FILE *fp)
|
|
{
|
|
char *buf = NULL;
|
|
size_t size = 0;
|
|
char *s;
|
|
size_t i, n, p;
|
|
Range *r;
|
|
|
|
while(afgets(&buf, &size, fp)) {
|
|
if(buf[i = strlen(buf)-1] == '\n')
|
|
buf[i] = 0;
|
|
if(mode == 'f' && !strchr(buf, delim)) {
|
|
if(!sflag)
|
|
puts(buf);
|
|
continue;
|
|
}
|
|
for(i = 0, p = 1, s = buf, r = list; r; r = r->next, s += n) {
|
|
s += seek(s, r->min, &p, i++);
|
|
if(!*s) break;
|
|
if(!r->max) {
|
|
fputs(s, stdout);
|
|
break;
|
|
}
|
|
n = seek(s, r->max + 1, &p, i++);
|
|
if(fwrite(s, 1, n, stdout) != n)
|
|
eprintf("write error:");
|
|
}
|
|
putchar('\n');
|
|
}
|
|
free(buf);
|
|
}
|
|
|
|
int
|
|
main(int argc, char *argv[])
|
|
{
|
|
FILE *fp;
|
|
|
|
ARGBEGIN {
|
|
case 'b':
|
|
case 'c':
|
|
case 'f':
|
|
mode = ARGC();
|
|
parselist(ARGF());
|
|
break;
|
|
case 'd':
|
|
delim = *ARGF();
|
|
break;
|
|
case 'n':
|
|
nflag = true;
|
|
break;
|
|
case 's':
|
|
sflag = true;
|
|
break;
|
|
default:
|
|
usage();
|
|
} ARGEND;
|
|
|
|
if(!mode)
|
|
usage();
|
|
if(!argc)
|
|
cut(stdin);
|
|
else for(; argc--; argv++) {
|
|
if(!(fp = strcmp(*argv, "-") ? fopen(*argv, "r") : stdin)) {
|
|
weprintf("fopen %s:", *argv);
|
|
continue;
|
|
}
|
|
cut(fp);
|
|
fclose(fp);
|
|
}
|
|
return EXIT_SUCCESS;
|
|
}
|