strtouint.h

来自「Firestorm NIDS是一个性能非常高的网络入侵检测系统 (NIDS)。目」· C头文件 代码 · 共 61 行

#ifndef __STRTOUINT_HEADER_INCLUDED__
#define __STRTOUINT_HEADER_INCLUDED__

/* Error detecting string to unsigned int conversion.
*  Return values:
*   <0 - error (such as overflow, or not-a-number)
*   =0 - the input string was perfect
*   >0 - the input string had trailing garbage, return
*        value tells you how many bytes were numbers.
*/
#include <ctype.h>
static inline int strtouint(const char *s, unsigned int *v)
{
	unsigned int d;
	int p=0;
	int base=10;

	if ( s[0]=='0' ) {
		base=8;
		s++;
		p++;
	}

	if ( *s && base==8 && *s=='x' ) {
		base=16;
		s++;
		p++;
	}

	if ( base <= 10 ) {
		for(*v=0; (d=(unsigned int)(*s - '0')) < base; p++) {
			*v=*v*base+d;
			s++;
		}
	}else{
		for(*v=0; ; p++) {
			if ( (d=(unsigned int)(*s - '0'))>=10 &&
				(d=((unsigned int)(tolower(*s) - 'a')+10))>=base ) break;
			*v=*v*base+d;
			s++;
		}
	}

	if ( p==0 ) {
		if ( base==8 ) {
			*v=0;
		}else{
			*v=0;
			return -1;
		}
	}
	if ( *s==0 ) return 0;
	return p;
}

#ifndef __PLUGIN__
#else
#endif

#endif /* __STRTOUINT_HEADER_INCLUDED__ */