sbase/expand.c
Tuukka Kataja 6561567597 Fix expand when one of multiple files can't be opened
Currently when multiple files are specified and one of them can't be opened,
expand doesn't correctly skip over the missing file. This patch fixes that.
2014-06-09 17:00:23 +01:00

111 lines
1.5 KiB
C

/* See LICENSE file for copyright and license details. */
#include <stdio.h>
#include <stdlib.h>
#include <wchar.h>
#include "util.h"
typedef struct {
FILE *fp;
const char *name;
} Fdescr;
static int expand(Fdescr *f, int tabstop);
static void
usage(void)
{
eprintf("usage: %s [-i] [-t n] [file...]\n", argv0);
}
int
main(int argc, char *argv[])
{
Fdescr dsc;
FILE *fp;
int tabstop = 8;
ARGBEGIN {
case 'i':
eprintf("not implemented\n");
case 't':
tabstop = estrtol(EARGF(usage()), 0);
break;
default:
usage();
} ARGEND;
if (argc == 0) {
dsc.name = "<stdin>";
dsc.fp = stdin;
expand(&dsc, tabstop);
} else {
for (; argc > 0; argc--, argv++) {
if (!(fp = fopen(*argv, "r"))) {
weprintf("fopen %s:", *argv);
continue;
}
dsc.name = *argv;
dsc.fp = fp;
expand(&dsc, tabstop);
fclose(fp);
}
}
return EXIT_SUCCESS;
}
static wint_t
in(Fdescr *f)
{
wint_t c = fgetwc(f->fp);
if (c == WEOF && ferror(f->fp))
eprintf("'%s' read error:", f->name);
return c;
}
static void
out(wint_t c)
{
putwchar(c);
if (ferror(stdout))
eprintf("write error:");
}
static int
expand(Fdescr *dsc, int tabstop)
{
int col = 0;
wint_t c;
for (;;) {
c = in(dsc);
if (c == WEOF)
break;
switch (c) {
case '\t':
do {
col++;
out(' ');
} while (col & (tabstop - 1));
break;
case '\b':
if (col)
col--;
out(c);
break;
case '\n':
col = 0;
out(c);
break;
default:
col++;
out(c);
break;
}
}
return 0;
}