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/* expand.c - expands tabs to space
*
* Copyright 2012 Jonathan Clairembault <jonathan at clairembault dot fr>
*
* See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/expand.html
USE_EXPAND(NEWTOY(expand, "t*", TOYFLAG_USR|TOYFLAG_BIN))
config EXPAND
bool "expand"
default y
help
usage: expand [-t tablist] [file...]
Expand tabs to spaces according to tabstops.
-t tablist
Specify tab stops, either a single number instead of the default 8,
or a comma separated list of increasing numbers representing tabstop
positions (absolute, not increments) with each additional tab beyound
that becoming one space.
*/
#define FOR_expand
#include "toys.h"
GLOBALS(
struct arg_list *tabs;
unsigned tabcount, *tab;
)
static void expand_file(int fd, char *name)
{
int i, len, x=0, stop = 0;
for (;;) {
len = read(fd, toybuf, sizeof(toybuf));
if (len<0) {
perror_msg("%s", name);
toys.exitval = 1;
return;
}
if (!len) break;
for (i=0; i<len; i++) {
int len = 1;
char c = toybuf[i];
if (c != '\t') {
if (EOF == putc(c, stdout)) perror_exit(0);
if (c == '\b' && x) len = -1;
if (c == '\n') {
x = stop = 0;
continue;
}
} else {
if (TT.tabcount < 2) {
len = TT.tabcount ? *TT.tab : 8;
len -= x%len;
} else while (stop < TT.tabcount) {
if (TT.tab[stop] > x) {
len = TT.tab[stop] - x;
break;
} else stop++;
}
xprintf("%*c", len, ' ');
}
x += len;
}
}
}
// Parse -t options to fill out unsigned array in tablist (if not NULL)
// return number of entries in tablist
static int parse_tablist(unsigned *tablist)
{
struct arg_list *tabs;
int tabcount = 0;
for (tabs = TT.tabs; tabs; tabs = tabs->next) {
char *s = tabs->arg;
while (*s) {
int count;
unsigned x, *t = tablist ? tablist+tabcount : &x;
if (tabcount >= sizeof(toybuf)/sizeof(unsigned)) break;
if (sscanf(s, "%u%n", t, &count) != 1) break;
if (tabcount++ && tablist && *(t-1) >= *t) break;
s += count;
if (*s==' ' || *s==',') s++;
else break;
}
if (*s) error_exit("bad tablist");
}
return tabcount;
}
void expand_main(void)
{
TT.tabcount = parse_tablist(NULL);
// Determine size of tablist, allocate memory, fill out tablist
if (TT.tabcount) {
TT.tab = xmalloc(sizeof(unsigned)*TT.tabcount);
parse_tablist(TT.tab);
}
loopfiles(toys.optargs, expand_file);
if (CFG_TOYBOX_FREE) free(TT.tab);
}
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