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/* paste.c - Merge corresponding lines
*
* Copyright 2012 Felix Janda <felix.janda@posteo.de>
*
* http://pubs.opengroup.org/onlinepubs/9699919799/utilities/paste.html
*
* Deviations from posix: the FILE argument isn't mandatory, none == '-'
USE_PASTE(NEWTOY(paste, "d:s", TOYFLAG_BIN|TOYFLAG_LOCALE))
config PASTE
bool "paste"
default y
help
usage: paste [-s] [-d DELIMITERS] [FILE...]
Merge corresponding lines from each input file.
-d list of delimiter characters to separate fields with (default is \t)
-s sequential mode: turn each input file into one line of output
*/
#define FOR_paste
#include "toys.h"
GLOBALS(
char *d;
int files;
)
// \0 is weird, and -d "" is also weird.
static void paste_files(void)
{
FILE **fps = (void *)toybuf;
char *dpos, *dstr, *buf, c;
int i, any, dcount, dlen, len, seq = toys.optflags&FLAG_s;
// Loop through lines until no input left
for (;;) {
// Start of each line/file resets delimiter cycle
dpos = TT.d;
for (i = any = dcount = dlen = 0; seq || i<TT.files; i++) {
size_t blen;
wchar_t wc;
FILE *ff = seq ? *fps : fps[i];
// Read and output line, preserving embedded NUL bytes.
buf = 0;
len = 0;
if (!ff || 0>=(len = getline(&buf, &blen, ff))) {
if (ff && ff!=stdin) fclose(ff);
if (seq) return;
fps[i] = 0;
if (!any) continue;
}
dcount = any ? 1 : i;
any = 1;
// Output delimiters as necessary: not at beginning/end of line,
// catch up if first few files had no input but a later one did.
// Entire line with no input means no output.
while (dcount) {
// Find next delimiter, which can be "", \n, or UTF8 w/combining chars
dstr = dpos;
dlen = 0;
dcount--;
if (!*TT.d) {;}
else if (*dpos == '\\') {
if (*++dpos=='0') dpos++;
else {
dlen = 1;
if ((c = unescape(*dpos))) {
dstr = &c;
dpos++;
}
}
} else {
while (0<(dlen = utf8towc(&wc, dpos, 99))) {
dpos += dlen;
if (!(dlen = wcwidth(wc))) continue;
if (dlen<0) dpos = dstr+1;
break;
}
dlen = dpos-dstr;
}
if (!*dpos) dpos = TT.d;
if (dlen) fwrite(dstr, dlen, 1, stdout);
}
if (0<len) {
fwrite(buf, len-(buf[len-1]=='\n'), 1, stdout);
free(buf);
}
}
// Only need a newline if we output something
if (any) xputc('\n');
else break;
}
}
static void do_paste(int fd, char *name)
{
FILE **fps = (void *)toybuf;
if (!(fps[TT.files++] = (fd ? fdopen(fd, "r") : stdin))) perror_exit(0);
if (TT.files >= sizeof(toybuf)/sizeof(FILE *)) perror_exit("tilt");
if (toys.optflags&FLAG_s) {
paste_files();
xputc('\n');
TT.files = 0;
}
}
void paste_main(void)
{
if (!(toys.optflags&FLAG_d)) TT.d = "\t";
loopfiles_rw(toys.optargs, O_RDONLY, 0, do_paste);
if (!(toys.optflags&FLAG_s)) paste_files();
}
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