File: extract_index.c

package info (click to toggle)
garlic 1.6-3
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, buster, sid
  • size: 4,516 kB
  • sloc: ansic: 52,465; makefile: 2,254
file content (57 lines) | stat: -rw-r--r-- 1,249 bytes parent folder | download | duplicates (6)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
/* Copyright (C) 2000 Damir Zucic */

/*=============================================================================

				extract_index.c

Purpose:
	Extract index from string.

Input:
	Input string pointer.

Output:
	Return value.

Return value:
	(1) Integer read from string, on success (positive or zero).
	(2) Negative on failure.

========includes:============================================================*/

#include <stdio.h>
#include <string.h>
#include <ctype.h>

#include "defines.h"

/*======extract index from a string:=========================================*/

int ExtractIndex_ (char *input_stringP)
{
int		index;
char		copyA[SHORTSTRINGSIZE];
char		*P;
int		n;

/* Copy the input string: */
strncpy (copyA, input_stringP, SHORTSTRINGSIZE - 1);
copyA[SHORTSTRINGSIZE - 1] = '\0';

/* Replace each non-numeric character except minus sign with space: */
P = copyA;
while ((n = *P++) != '\0') if (!isdigit (n) && (n != '-')) *(P - 1) = ' ';

/* Try to read one integer: */
if (sscanf (copyA, "%d", &index) != 1) return -1;

/* Check the sign: */
if (index < 0) return -2;

/* If everything worked fine, return the extracted index: */
return index;
}

/*===========================================================================*/