blob: c4815f68c67da7781a5720cb8f14bd276933ec8a (
plain)
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
|
/*++
/* NAME
/* alldig 3
/* SUMMARY
/* predicate if string is all numerical
/* SYNOPSIS
/* #include <stringops.h>
/*
/* int alldig(string)
/* const char *string;
/* DESCRIPTION
/* alldig() determines if its argument is an all-numerical string.
/* SEE ALSO
/* An alldig() routine appears in Brian W. Kernighan, P.J. Plauger:
/* "Software Tools", Addison-Wesley 1976.
/* LICENSE
/* .ad
/* .fi
/* The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/* Wietse Venema
/* IBM T.J. Watson Research
/* P.O. Box 704
/* Yorktown Heights, NY 10598, USA
/*--*/
/* System library. */
#include <sys_defs.h>
#include <ctype.h>
/* Utility library. */
#include <stringops.h>
/* alldig - return true if string is all digits */
int alldig(const char *string)
{
const char *cp;
if (*string == 0)
return (0);
for (cp = string; *cp != 0; cp++)
if (!ISDIGIT(*cp))
return (0);
return (1);
}
|
