/
string.c
194 lines (176 loc) · 3.75 KB
/
string.c
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/*
* helper functions - string conversion
*
* Stefan Biereigel
*
*/
#include <inttypes.h>
/* atoid32
* converts a fixed-length input string to 32bit integers,
* containing respective integer and decimal parts of input string
*/
void atoid32(char *string, uint8_t len, uint32_t *integer, uint32_t *decimal) {
uint8_t j;
uint32_t mult = 1;
uint8_t int_port = 0;
*integer = 0;
*decimal = 0;
for (j = 0; j < len; j++) {
if (*(string + len - j - 1) == '.') {
mult = 1;
int_port = 1;
} else {
if (int_port) {
*integer += mult * (*(string + len - j - 1) - '0');
} else {
*decimal += mult * (*(string + len - j - 1) - '0');
}
mult *= 10;
}
}
}
/* atod32
* converts a fixed-length input string to 32bit integer, representing its decimal part,
*/
void atod32(char *string, uint8_t len, uint32_t *decimal) {
uint8_t j;
uint32_t mult = 1;
*decimal = 0;
for (j = 0; j < len; j++) {
if (*(string + len - j - 1) == '.') {
return;
} else {
*decimal += mult * (*(string + len - j - 1) - '0');
mult *= 10;
}
}
}
/* atoi32
* converts a fixed-length input string to 32bit integer, stops at decimal points,
* so only integer part is returned
*
* the number MUST include a decimal portion (XX.XX)
*/
void atoi32(volatile char *string, uint8_t len, uint32_t *integer) {
uint8_t j;
uint32_t mult = 1;
uint8_t start = 0;
*integer = 0;
for (j = 0; j < len; j++) {
if (*(string + len - j - 1) == '.') {
start = 1;
} else {
if (start) {
*integer += mult * (*(string + len - j - 1) - '0');
mult *= 10;
}
}
}
}
/* atoi16
* converts a fixed-length input string to 16bit integer, stops at decimal points,
* so only integer part is returned
*
* the number MUST include a decimal portion (XX.XX)
*/
void atoi16(volatile char *string, uint8_t len, uint16_t *integer) {
uint8_t j;
uint16_t mult = 1;
uint8_t start = 0;
*integer = 0;
for (j = 0; j < len; j++) {
if (*(string + len - j - 1) == '.') {
start = 1;
} else {
if (start) {
*integer += mult * (*(string + len - j - 1) - '0');
mult *= 10;
}
}
}
}
/* atoi8
* converts a fixed-length input string to 8bit integer, stops at decimal points,
* so only integer part is returned
*
* the input MUST NOT include a decimal portion
*/
void atoi8(volatile char *string, uint8_t len, uint8_t *integer) {
uint8_t j;
uint32_t mult = 1;
*integer = 0;
for (j = 0; j < len; j++) {
*integer += mult * (*(string + len - j - 1) - '0');
mult *= 10;
}
}
/* i32toa
* 32 bit number to fixed-length output char
*/
void i32toa(uint32_t in, uint8_t len, volatile char *out) {
uint8_t i;
uint32_t mult = 1;
for (i = len; i > 0; i--) {
*(out + i - 1) = ((in % (mult*10)) / mult) + '0';
mult *= 10;
}
}
/* i16toa
* 16 bit number to fixed-length output char
*/
void i16toa(uint16_t in, uint8_t len, volatile char *out) {
uint8_t i;
uint16_t mult = 1;
for (i = len; i > 0; i--) {
*(out + i - 1) = ((in % (mult*10)) / mult) + '0';
mult *= 10;
}
}
/* i16toa
* 16 bit number to variable-length output char
*
* returns: length of string
*/
uint8_t i16toav(uint16_t in, volatile char *out) {
uint16_t mult = 10000;
uint8_t cnt = 0;
uint8_t start = 0;
uint8_t len = 0;
if (in == 0) {
*out = '0';
return 1;
}
while(mult > 0) {
if (in >= mult) {
in = in - mult;
cnt++;
start = 1;
} else {
*out = cnt + '0';
cnt = 0;
mult /= 10;
if (start) {
out++;
len++;
}
}
}
return len;
}
/* i16tox
* 16 bit number to hexadecimal char representation
*
* writes 4 chars to the output pointer
*/
void i16tox(uint16_t x, char *out) {
uint8_t i;
uint8_t tmp;
for (i = 0; i < 4; i++) {
tmp = (uint8_t) ((x >> (4*i)) & 0x000f);
if (tmp < 10) {
*(out+3-i) = '0' + tmp;
} else {
*(out+3-i) = 'A' + tmp - 10;
}
}
}