DeforaOS/utils
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Works in one case (bytes, seekable)

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This commit is contained in:
Pierre Pronchery 2007-06-26 08:47:06 +00:00
parent 39924d1c66
commit e07dfc0403
1 changed files with 32 additions and 3 deletions
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35
src/tail.c
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@ -34,7 +34,8 @@ typedef struct _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_do_bytes(Prefs * prefs, FILE * fp, char const * filename);
static int _tail_do_lines(Prefs * prefs, FILE * fp, char const * filename);
static int _tail(Prefs * prefs, char const * filename)
{
@ -43,7 +44,12 @@ static int _tail(Prefs * prefs, char const * filename)
if(filename != NULL && (fp = fopen(filename, "r")) == NULL)
return _tail_error(filename, 1);
ret = _tail_do(prefs, fp, filename != NULL ? filename : "stdin");
if(prefs->bytes != 0)
ret = _tail_do_bytes(prefs, fp, filename != NULL
? filename : "stdin");
else
ret = _tail_do_lines(prefs, fp, filename != NULL
? filename : "stdin");
if(filename != NULL && fclose(fp) != 0)
return _tail_error(filename, 1);
return ret;
@ -56,9 +62,29 @@ static int _tail_error(char const * message, int ret)
return ret;
}
static int _tail_do(Prefs * prefs, FILE * fp, char const * filename)
static int _tail_do_bytes(Prefs * prefs, FILE * fp, char const * filename)
{
char buf[256];
size_t i;
long c = prefs->bytes;
if(fseek(fp, c > 0 ? c - 1 : c, c > 0 ? SEEK_SET : SEEK_END) != 0)
{
fputs("tail: Not implemented yet\n", stderr);
return 1;
}
while((i = fread(buf, 1, sizeof(buf), fp)) > 0)
if(fwrite(buf, 1, i, stdout) != i)
return _tail_error("stdout", 1);
if(!feof(fp))
return _tail_error(filename, 1);
return 0;
}
static int _tail_do_lines(Prefs * prefs, FILE * fp, char const * filename)
{
/* FIXME implement */
fputs("tail: Not implemented yet\n", stderr);
return 1;
}
@ -79,6 +105,7 @@ int main(int argc, char * argv[])
char * p;
memset(&prefs, 0, sizeof(prefs));
prefs.lines = 10;
while((o = getopt(argc, argv, "fc:n:")) != -1)
switch(o)
{
@ -86,11 +113,13 @@ int main(int argc, char * argv[])
prefs.flags |= PREFS_f;
break;
case 'c':
prefs.lines = 0;
prefs.bytes = strtol(optarg, &p, 10);
if(optarg[0] == '\0' || *p != '\0')
return _usage();
break;
case 'n':
prefs.bytes = 0;
prefs.lines = strtol(optarg, &p, 10);
if(optarg[0] == '\0' || *p != '\0')
return _usage();