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Allow byte/character positions >_POSIX2_LINE_MAX to be specified by

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dynamically growing the `positions' array.
This commit is contained in:
Tim J. Robbins 2002-05-24 09:11:18 +00:00
parent d42862594a
commit a8522a9bb7
1 changed files with 24 additions and 6 deletions
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30
usr.bin/cut/cut.c
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@ -62,6 +62,7 @@ void c_cut (FILE *, const char *);
void f_cut (FILE *, const char *);
void get_list (char *);
int main (int, char **);
void needpos(size_t);
static void usage (void);
int
@ -133,7 +134,7 @@ main(argc, argv)
size_t autostart, autostop, maxval;
char positions[_POSIX2_LINE_MAX + 1];
char *positions;
void
get_list(list)
@ -175,23 +176,40 @@ get_list(list)
errx(1, "[-cf] list: illegal list value");
if (!stop || !start)
errx(1, "[-cf] list: values may not include zero");
if (stop > _POSIX2_LINE_MAX)
errx(1, "[-cf] list: %ld too large (max %d)",
(long)stop, _POSIX2_LINE_MAX);
if (maxval < stop)
if (maxval < stop) {
maxval = stop;
needpos(maxval + 1);
}
for (pos = positions + start; start++ <= stop; *pos++ = 1);
}
/* overlapping ranges */
if (autostop && maxval > autostop)
if (autostop && maxval > autostop) {
maxval = autostop;
needpos(maxval + 1);
}
/* set autostart */
if (autostart)
memset(positions + 1, '1', autostart);
}
void
needpos(size_t n)
{
static size_t npos;
/* Grow the positions array to at least the specified size. */
if (n > npos) {
if (npos == 0)
npos = n;
while (n > npos)
npos *= 2;
if ((positions = realloc(positions, npos)) == NULL)
err(1, "realloc");
}
}
/* ARGSUSED */
void
c_cut(fp, fname)