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/******************************************************************************
*
* Filename: p_string.c
*
* Instantiation of basic string operations to prevent inclusion of full
* string library. These are simple implementations not necessarily optimized
* for speed, but rather to show intent.
*
* Revision information:
*
* 20AUG2004 kb_admin initial creation
* 12JAN2005 kb_admin minor updates
*
* BEGIN_KBDD_BLOCK
* No warranty, expressed or implied, is included with this software. It is
* provided "AS IS" and no warranty of any kind including statutory or aspects
* relating to merchantability or fitness for any purpose is provided. All
* intellectual property rights of others is maintained with the respective
* owners. This software is not copyrighted and is intended for reference
* only.
* END_BLOCK
*
* $FreeBSD$
*****************************************************************************/
#include "p_string.h"
/*
* .KB_C_FN_DEFINITION_START
* int p_IsWhiteSpace(char)
* This global function returns true if the character is not considered
* a non-space character.
* .KB_C_FN_DEFINITION_END
*/
int
p_IsWhiteSpace(char cValue)
{
return ((cValue == ' ') ||
(cValue == '\t') ||
(cValue == 0) ||
(cValue == '\r') ||
(cValue == '\n'));
}
/*
* .KB_C_FN_DEFINITION_START
* unsigned p_HexCharValue(char)
* This global function returns the decimal value of the validated hex char.
* .KB_C_FN_DEFINITION_END
*/
unsigned
p_HexCharValue(char cValue)
{
if (cValue < ('9' + 1))
return (cValue - '0');
if (cValue < ('F' + 1))
return (cValue - 'A' + 10);
return (cValue - 'a' + 10);
}
/*
* .KB_C_FN_DEFINITION_START
* void p_memset(char *buffer, char value, int size)
* This global function sets memory at the pointer for the specified
* number of bytes to value.
* .KB_C_FN_DEFINITION_END
*/
void
p_memset(char *buffer, char value, int size)
{
while (size--)
*buffer++ = value;
}
/*
* .KB_C_FN_DEFINITION_START
* int p_strlen(char *)
* This global function returns the number of bytes starting at the pointer
* before (not including) the string termination character ('/0').
* .KB_C_FN_DEFINITION_END
*/
int
p_strlen(const char *buffer)
{
int len = 0;
if (buffer)
while (buffer[len])
len++;
return (len);
}
/*
* .KB_C_FN_DEFINITION_START
* char *p_strcpy(char *to, char *from)
* This global function returns a pointer to the end of the destination string
* after the copy operation (after the '/0').
* .KB_C_FN_DEFINITION_END
*/
char *
p_strcpy(char *to, const char *from)
{
while (*from)
*to++ = *from++;
*to++ = '\0';
return (to);
}
/*
* .KB_C_FN_DEFINITION_START
* unsigned p_ASCIIToHex(char *)
* This global function set the unsigned value equal to the converted
* hex number passed as a string. No error checking is performed; the
* string must be valid hex value, point at the start of string, and be
* NULL-terminated.
* .KB_C_FN_DEFINITION_END
*/
unsigned
p_ASCIIToHex(const char *buf)
{
unsigned lValue = 0;
if ((*buf == '0') && ((buf[1] == 'x') || (buf[1] == 'X')))
buf += 2;
while (*buf) {
lValue <<= 4;
lValue += p_HexCharValue(*buf++);
}
return (lValue);
}
/*
* .KB_C_FN_DEFINITION_START
* unsigned p_ASCIIToDec(char *)
* This global function set the unsigned value equal to the converted
* decimal number passed as a string. No error checking is performed; the
* string must be valid decimal value, point at the start of string, and be
* NULL-terminated.
* .KB_C_FN_DEFINITION_END
*/
unsigned
p_ASCIIToDec(const char *buf)
{
unsigned v = 0;
while (*buf) {
v *= 10;
v += (*buf++) - '0';
}
return (v);
}
/*
* .KB_C_FN_DEFINITION_START
* void p_memcpy(char *, char *, unsigned)
* This global function copies data from the first pointer to the second
* pointer for the specified number of bytes.
* .KB_C_FN_DEFINITION_END
*/
void
p_memcpy(char *to, const char *from, unsigned size)
{
while (size--)
*to++ = *from++;
}
/*
* .KB_C_FN_DEFINITION_START
* int p_memcmp(char *to, char *from, unsigned size)
* This global function compares data at to against data at from for
* size bytes. Returns 0 if the locations are equal. size must be
* greater than 0.
* .KB_C_FN_DEFINITION_END
*/
int
p_memcmp(const char *to, const char *from, unsigned size)
{
while ((--size) && (*to++ == *from++))
continue;
return (*to != *from);
}
/*
* .KB_C_FN_DEFINITION_START
* int p_strcmp(char *to, char *from)
* This global function compares string at to against string at from.
* Returns 0 if the locations are equal.
* .KB_C_FN_DEFINITION_END
*/
int
p_strcmp(const char *to, const char *from)
{
while (*to && *from && (*to == *from)) {
++to;
++from;
}
return (!((!*to) && (*to == *from)));
}
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