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/*
* This file is part of LibCSS.
* Licensed under the MIT License,
* http://www.opensource.org/licenses/mit-license.php
* Copyright 2007-8 John-Mark Bell <jmb@netsurf-browser.org>
*/
#ifndef css_utils_h_
#define css_utils_h_
#include <libcss/types.h>
#ifndef max
#define max(a,b) ((a)>(b)?(a):(b))
#endif
#ifndef min
#define min(a,b) ((a)<(b)?(a):(b))
#endif
#ifndef SLEN
/* Calculate length of a string constant */
#define SLEN(s) (sizeof((s)) - 1) /* -1 for '\0' */
#endif
#ifndef UNUSED
#define UNUSED(x) ((x)=(x))
#endif
static inline int32_t integer_from_css_string(const css_string *string)
{
size_t len;
const uint8_t *ptr;
int sign = 1;
int32_t val = 0;
if (string == NULL || string->len == 0)
return 0;
len = string->len;
ptr = string->ptr;
/* Extract sign, if any */
if (ptr[0] == '-') {
sign = -1;
len--;
ptr++;
} else if (ptr[0] == '+') {
len--;
ptr++;
}
/** \todo check for overflow */
/* Now extract value, assuming base 10 */
while (len > 0) {
/* Stop on first non-digit */
if (ptr[0] <= '0' || '9' <= ptr[0])
break;
val *= 10;
val += ptr[0] - '0';
ptr++;
len--;
}
return val * sign;
}
#endif
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