DeforaOS/utils
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Started implementation

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This commit is contained in:
Pierre Pronchery 2007-06-26 08:17:30 +00:00
parent 45a3956e23
commit 39924d1c66
1 changed files with 49 additions and 3 deletions
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52
src/tail.c
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@ -17,11 +17,46 @@
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <limits.h>
/* tail */
static int _tail(void)
/* types */
typedef struct _Prefs
{
int flags;
int bytes;
int lines;
} Prefs;
#define PREFS_f 0x1
static int _tail_error(char const * message, int ret);
static int _tail_do(Prefs * prefs, FILE * fp, char const * filename);
static int _tail(Prefs * prefs, char const * filename)
{
int ret;
FILE * fp = stdin;
if(filename != NULL && (fp = fopen(filename, "r")) == NULL)
return _tail_error(filename, 1);
ret = _tail_do(prefs, fp, filename != NULL ? filename : "stdin");
if(filename != NULL && fclose(fp) != 0)
return _tail_error(filename, 1);
return ret;
}
static int _tail_error(char const * message, int ret)
{
fputs("tail: ", stderr);
perror(message);
return ret;
}
static int _tail_do(Prefs * prefs, FILE * fp, char const * filename)
{
/* FIXME implement */
return 1;
@ -40,19 +75,30 @@ static int _usage(void)
int main(int argc, char * argv[])
{
int o;
Prefs prefs;
char * p;
/* FIXME actually collect arguments */
memset(&prefs, 0, sizeof(prefs));
while((o = getopt(argc, argv, "fc:n:")) != -1)
switch(o)
{
case 'f':
prefs.flags |= PREFS_f;
break;
case 'c':
prefs.bytes = strtol(optarg, &p, 10);
if(optarg[0] == '\0' || *p != '\0')
return _usage();
break;
case 'n':
prefs.lines = strtol(optarg, &p, 10);
if(optarg[0] == '\0' || *p != '\0')
return _usage();
break;
default:
return _usage();
}
return _tail() ? 0 : 2;
if(optind != argc && optind + 1 != argc)
return _usage();
return _tail(&prefs, argv[optind]) ? 0 : 2;
}