Date: Fri, 1 Nov 2019 00:56:18 -0400 From: Kurt Hackenberg <kh@panix.com> To: freebsd-questions@freebsd.org Subject: Re: grep for ascii nul Message-ID: <61f96c80-7965-9c80-30dc-b153e418b668@panix.com> In-Reply-To: <558fd145-ad3e-90dc-5930-c01ca0c27d3c@panix.com> References: <20191101024817.GA60134@admin.sibptus.ru> <558fd145-ad3e-90dc-5930-c01ca0c27d3c@panix.com>
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On 2019-11-01 00:44, Kurt Hackenberg wrote:
> You could use the attached program, which I wrote some time ago for this
> purpose.
Huh. The attachment didn't come through. Does this list forbid attachments?
Anyway, here's the program inline. It's C.
----------------------------
#include <stdio.h>
#include <errno.h>
#include <string.h>
typedef int BOOL;
#define TRUE 1
#define FALSE 0
static void qerror(char *me, char *thing)
{
char tmp[1024 + 255 + 2 + 1]; /* max pathname + max filename + junk
+ NUL */
sprintf(tmp, "%s: %s", me, thing);
perror(tmp);
}
static BOOL doit(FILE *fin)
{
int c;
while ((c = getc(fin)) != EOF)
if (c == '\0')
return TRUE;
return FALSE;
}
int main(int argc, char *argv[], char *envp[])
{
FILE *fin;
char *me;
if ((me = strrchr(*argv, '/')) != NULL)
me++;
else
me = *argv;
argc--, argv++;
if (argc > 0)
do
{
if ((fin = fopen(*argv, "r")) != NULL)
{
if (doit(fin))
printf("%s\n", *argv);
if (fclose(fin) != 0)
qerror(me, *argv);
}
else
qerror(me, *argv);
} while (++argv, --argc > 0);
else
if (doit(stdin))
printf("<stdin>\n");
return errno;
}
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