sbase/cut.c

197 lines
3.3 KiB
C
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/* See LICENSE file for copyright and license details. */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
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#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 int nflag = 0;
static int sflag = 0;
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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) {
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r->next = l;
break;
} else if (!l->max || r->min < l->max + 2) {
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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;
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l->max = (p->max && r->max) ? MAX(p->max, r->max) : 0;
l->next = t;
return;
}
}
if (p)
p->next = r;
else
list = r;
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}
static void
parselist(char *str)
{
char *s;
size_t n = 1;
Range *r;
for (s = str; *s; s++) {
if (*s == ' ')
*s = ',';
if (*s == ',')
n++;
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}
if (!(r = malloc(n * sizeof(Range))))
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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;
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r->next = NULL;
if (!r->min || (r->max && r->max < r->min) || (*s && *s != ','))
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eprintf("cut: bad list value\n");
insert(r++);
}
}
static void
freelist(void) {
Range *l = list, *next;
while (l) {
next = l->next;
free(l);
l->next = NULL;
l = next;
}
}
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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)))
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return t - s;
if (nflag)
while (n && !UTF8_POINT(s[n]))
n--;
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*prev += n;
return n;
} else if (mode == 'c') {
for (n++, t = s; *t; t++)
if (UTF8_POINT(*t) && !--n)
break;
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} else {
for (t = (count < 2) ? s : s + 1; n && *t; t++)
if (*t == delim && !--n && count)
break;
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}
*prev = pos;
return t - s;
}
static void
cut(FILE *fp)
{
char *buf = NULL, *s;
size_t size = 0, i, n, p;
ssize_t len;
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Range *r;
while ((len = agetline(&buf, &size, fp)) != -1) {
if (len && buf[len - 1] == '\n')
buf[len - 1] = '\0';
if (mode == 'f' && !strchr(buf, delim)) {
if (!sflag)
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puts(buf);
continue;
}
for (i = 0, p = 1, s = buf, r = list; r; r = r->next, s += n) {
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s += seek(s, r->min, &p, i++);
if (!*s)
break;
if (!r->max) {
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fputs(s, stdout);
break;
}
n = seek(s, r->max + 1, &p, i++);
if (fwrite(s, 1, n, stdout) != n)
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eprintf("write error:");
}
putchar('\n');
}
free(buf);
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}
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 = 1;
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break;
case 's':
sflag = 1;
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break;
default:
usage();
} ARGEND;
if (!mode)
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usage();
if (!argc)
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cut(stdin);
else {
for (; argc--; argv++) {
if (strcmp(*argv, "-"))
fp = fopen(*argv, "r");
else
fp = stdin;
if (!fp) {
weprintf("fopen %s:", *argv);
continue;
}
cut(fp);
if (fp != stdin)
fclose(fp);
}
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}
freelist();
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return 0;
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}