btrfs-progs/string-table.c
David Sterba 407f928cd2 btrfs-progs: add function attributes for the printf-like
Reported by gcc -Wsuggest-attribute=format .

Signed-off-by: David Sterba <dsterba@suse.com>
2016-01-12 15:02:55 +01:00

152 lines
3.3 KiB
C

/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License v2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 021110-1307, USA.
*/
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <stdarg.h>
#include "string-table.h"
/*
* This function create an array of char * which will represent a table
*/
struct string_table *table_create(int columns, int rows)
{
struct string_table *tab;
int size;
size = sizeof(struct string_table) + rows * columns * sizeof(char*);
tab = calloc(1, size);
if (!tab)
return NULL;
tab->ncols = columns;
tab->nrows = rows;
return tab;
}
/*
* This function is like a vprintf, but store the results in a cell of
* the table.
* If fmt starts with '<', the text is left aligned; if fmt starts with
* '>' the text is right aligned. If fmt is equal to '=' the text will
* be replaced by a '=====' dimensioned on the basis of the column width
*/
char *table_vprintf(struct string_table *tab, int column, int row,
char *fmt, va_list ap)
{
int idx = tab->ncols * row + column;
char *msg = calloc(100, 1);
if (!msg)
return NULL;
if (tab->cells[idx])
free(tab->cells[idx]);
tab->cells[idx] = msg;
vsnprintf(msg, 99, fmt, ap);
return msg;
}
/*
* This function is like a printf, but store the results in a cell of
* the table.
*/
__attribute__ ((format (printf, 4, 5)))
char *table_printf(struct string_table *tab, int column, int row,
char *fmt, ...)
{
va_list ap;
char *ret;
va_start(ap, fmt);
ret = table_vprintf(tab, column, row, fmt, ap);
va_end(ap);
return ret;
}
/*
* This function dumps the table. Every "=" string will be replaced by
* a "=======" length as the column
*/
void table_dump(struct string_table *tab)
{
int sizes[tab->ncols];
int i, j;
for (i = 0; i < tab->ncols; i++) {
sizes[i] = 0;
for (j = 0; j < tab->nrows; j++) {
int idx = i + j * tab->ncols;
int len;
if (!tab->cells[idx])
continue;
len = strlen(tab->cells[idx]) - 1;
if (len == 0 || tab->cells[idx][0] == '*')
continue;
if (len > sizes[i])
sizes[i] = len;
}
}
for (j = 0; j < tab->nrows; j++) {
for (i = 0; i < tab->ncols; i++) {
int idx = i + j * tab->ncols;
char *cell = tab->cells[idx];
if (!cell || !strlen(cell)) {
printf("%*s", sizes[i], "");
} else if (cell && cell[0] == '*' && cell[1]) {
int k = sizes[i];
while (k--)
putchar(cell[1]);
} else {
printf("%*s",
cell[0] == '<' ? -sizes[i] : sizes[i],
cell + 1);
}
if (i != (tab->ncols - 1))
putchar(' ');
}
putchar('\n');
}
}
/*
* Deallocate a table and all of its content
*/
void table_free(struct string_table *tab)
{
int i, count;
count = tab->ncols * tab->nrows;
for (i = 0; i < count; i++)
if (tab->cells[i])
free(tab->cells[i]);
free(tab);
}