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Add support for arbitrary length delimiters in cut(1)

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Having multibyte delimiters is not enough. For full flexibility,
the possiblity of cutting input lines with arbitrary length delimiters
is the real deal.
Given this functionality, it only sounds reasonable to also add support
to resolve escapes.
Thanks to Truls Becken for making the suggestion and designing such a
flexible cut(1)-implementation!
This commit is contained in:
FRIGN
2015-01-22 20:19:48 +01:00
parent 37d30f2bd8
commit 2277b619be
2 changed files with 42 additions and 19 deletions
Download Patch File Download Diff File Expand all files Collapse all files

59
cut.c
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@@ -14,7 +14,7 @@ typedef struct Range {
static Range *list = NULL;
static char mode = 0;
static Rune delim = '\t';
static char *delim = "\t";
static size_t delimlen = 1;
static int nflag = 0;
static int sflag = 0;
@@ -73,7 +73,6 @@ seek(const char *s, size_t pos, size_t *prev, size_t count)
{
const char *t;
size_t n = pos - *prev, i;
Rune r;
if (mode == 'b') {
if ((t = memchr(s, '\0', n)))
@@ -89,12 +88,13 @@ seek(const char *s, size_t pos, size_t *prev, size_t count)
break;
} else {
for (t = (count < delimlen + 1) ? s : s + delimlen; n && *t; ) {
for (i = 1; t[i]; i++)
if (fullrune(t, i))
if (!strncmp(t, delim, delimlen)) {
if (!--n && count)
break;
charntorune(&r, t, i);
if (r == delim && !--n && count)
break;
t += delimlen;
continue;
}
for (i = 1; !fullrune(t, i); i++);
t += i;
}
}
@@ -116,7 +116,7 @@ cut(FILE *fp)
while ((len = getline(&buf, &size, fp)) != -1) {
if (len && buf[len - 1] == '\n')
buf[len - 1] = '\0';
if (mode == 'f' && !utfrune(buf, delim)) {
if (mode == 'f' && !utfutf(buf, delim)) {
if (!sflag)
puts(buf);
continue;
@@ -139,6 +139,36 @@ cut(FILE *fp)
}
}
static size_t
resolveescapes(char *s, size_t len)
{
size_t i, off, m;
for (i = 0; i < len - 1; i++) {
if (s[i] != '\\')
continue;
off = 0;
switch (s[i + 1]) {
case '\\': s[i] = '\\'; off++; break;
case 'a': s[i] = '\a'; off++; break;
case 'b': s[i] = '\b'; off++; break;
case 'f': s[i] = '\f'; off++; break;
case 'n': s[i] = '\n'; off++; break;
case 'r': s[i] = '\r'; off++; break;
case 't': s[i] = '\t'; off++; break;
case 'v': s[i] = '\v'; off++; break;
default: continue;
}
for (m = i + 1; m <= len - off; m++)
s[m] = s[m + off];
len -= off;
}
return len;
}
static void
usage(void)
{
@@ -151,24 +181,17 @@ int
main(int argc, char *argv[])
{
FILE *fp;
int i;
char *m, *d;
ARGBEGIN {
case 'b':
case 'c':
case 'f':
mode = ARGC();
m = EARGF(usage());
parselist(m);
parselist(EARGF(usage()));
break;
case 'd':
d = EARGF(usage());
for (i = 1; i <= strlen(d); i++)
if (fullrune(d, i))
break;
charntorune(&delim, d, i);
delimlen = i;
delim = EARGF(usage());
delimlen = resolveescapes(delim, strlen(delim));
break;
case 'n':
nflag = 1;