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/* $Id: numbers.c 9024 2010-03-21 16:49:30Z iulius $
**
** Routines for numbers: manipulation and checks.
*/
#include "config.h"
#include "clibrary.h"
#include <ctype.h>
#include "inn/libinn.h"
/*
** Check if the argument is a valid article number according to RFC 3977,
** that is to say it contains from 1 to 16 digits.
*/
bool
IsValidArticleNumber(const char *string)
{
int len = 0;
const unsigned char *p;
/* Not NULL. */
if (string == NULL)
return false;
p = (const unsigned char *) string;
for (; *p != '\0'; p++) {
len++;
if (!isdigit((unsigned char) *p))
return false;
}
if (len > 0 && len < 17)
return true;
else
return false;
}
/*
** Return true if the provided string is a valid range, that is to say:
**
** - An article number.
** - An article number followed by a dash to indicate all following.
** - An article number followed by a dash followed by another article
** number.
**
** In addition to RFC 3977, we also accept:
** - A dash followed by an article number to indicate all previous.
** - A dash for everything.
*/
bool
IsValidRange(char *string)
{
char *p;
bool valid;
/* Not NULL. */
if (string == NULL)
return false;
/* Just a dash. */
if (strcmp(string, "-") == 0)
return true;
p = string;
/* Begins with a dash. There must be a number after. */
if (*string == '-') {
p++;
return IsValidArticleNumber(p);
}
/* Got just a single number? */
if ((p = strchr(string, '-')) == NULL)
return IsValidArticleNumber(string);
/* "-" becomes "\0" and we parse the low water mark. */
*p++ = '\0';
if (*p == '\0') {
/* Ends with a dash. */
valid = IsValidArticleNumber(string);
} else {
valid = (IsValidArticleNumber(string) && IsValidArticleNumber(p));
}
p--;
*p = '-';
return valid;
}
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