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AP_HAL: added Util.cpp

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common printf functions
This commit is contained in:
Andrew Tridgell 2013-09-21 14:25:42 +10:00
parent 05b426c1fc
commit 0063f1fad8
1 changed files with 59 additions and 0 deletions
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59
libraries/AP_HAL/Util.cpp Normal file
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#include <AP_HAL.h>
#include "Util.h"
#include "utility/print_vprintf.h"
/* Helper class implements AP_HAL::Print so we can use utility/vprintf */
class BufferPrinter : public AP_HAL::Print {
public:
BufferPrinter(char* str, size_t size) : _offs(0), _str(str), _size(size) {}
size_t write(uint8_t c) {
if (_offs < _size) {
_str[_offs] = c;
_offs++;
return 1;
} else {
return 0;
}
}
size_t _offs;
char* const _str;
const size_t _size;
};
int AP_HAL::Util::snprintf(char* str, size_t size, const char *format, ...)
{
va_list ap;
va_start(ap, format);
int res = this->vsnprintf(str, size, format, ap);
va_end(ap);
return res;
}
int AP_HAL::Util::snprintf_P(char* str, size_t size, const prog_char_t *format, ...)
{
va_list ap;
va_start(ap, format);
int res = this->vsnprintf_P(str, size, format, ap);
va_end(ap);
return res;
}
int AP_HAL::Util::vsnprintf(char* str, size_t size, const char *format, va_list ap)
{
BufferPrinter buf(str, size);
print_vprintf(&buf, 0, format, ap);
// null terminate if possible
buf.write(0);
return (int) buf._offs;
}
int AP_HAL::Util::vsnprintf_P(char* str, size_t size, const prog_char_t *format,
va_list ap)
{
BufferPrinter buf(str, size);
print_vprintf(&buf, 1,(const char*) format, ap);
// null terminate if possible
buf.write(0);
return (int) buf._offs;
}