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Implemented tail by line count

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This commit is contained in:
Pierre Pronchery 2007-08-22 01:55:50 +00:00
parent 8d22adb9c2
commit f136e46342
1 changed files with 71 additions and 3 deletions
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74
src/tail.c
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@ -81,11 +81,79 @@ static int _tail_do_bytes(Prefs * prefs, FILE * fp, char const * filename)
return 0;
}
/* tail_do_lines */
static void _lines_rotate(char ** lines, int pos);
static int _lines_realloc(char ** lines, int pos, size_t column);
static void _lines_print(char ** lines, int pos);
static int _tail_do_lines(Prefs * prefs, FILE * fp, char const * filename)
{
/* FIXME implement */
fputs("tail: Not implemented yet\n", stderr);
return 1;
int ret = 0;
char ** lines;
int c;
int pos = 0;
size_t column = 0;
if(prefs->lines == 0)
return 0;
if((lines = calloc(sizeof(*lines), prefs->lines)) == NULL)
return _tail_error(filename, 1);
while((c = fgetc(fp)) != EOF)
{
if(column == 0 && lines[pos] != NULL)
{
if(pos + 1 < prefs->lines)
pos++;
else
_lines_rotate(lines, pos);
}
if(_lines_realloc(lines, pos, column) != 0)
break;
if(c != '\n')
{
lines[pos][column++] = c;
continue;
}
lines[pos][column] = '\0';
column = 0;
}
_lines_print(lines, pos);
if(c != EOF || !feof(fp))
ret = _tail_error(filename, 1);
free(lines);
return ret;
}
static void _lines_rotate(char ** lines, int pos)
{
int i;
free(lines[0]);
for(i = 1; i <= pos; i++)
lines[i - 1] = lines[i];
lines[pos] = NULL;
}
static int _lines_realloc(char ** lines, int pos, size_t column)
{
char * p;
if((p = realloc(lines[pos], column + 1)) == NULL)
return 1;
lines[pos] = p;
return 0;
}
static void _lines_print(char ** lines, int pos)
{
int i;
for(i = 0; i <= pos; i++)
{
fputs(lines[i], stdout);
free(lines[i]);
fputc('\n', stdout);
}
}