97 lines
1.9 KiB
C
97 lines
1.9 KiB
C
//---
|
|
// gint:core:string - replicas of a few string functions
|
|
//---
|
|
|
|
#include <gint/defs/types.h>
|
|
#include <gint/defs/attributes.h>
|
|
#include <stdarg.h>
|
|
|
|
GWEAK size_t strlen(const char *str)
|
|
{
|
|
int len = 0;
|
|
while(str[len]) len++;
|
|
return len;
|
|
}
|
|
|
|
/* vsprintf() - a trimmed-down version of the function
|
|
This function supports formats '%%', '%nd', '%nx' and '%s' where 'n' is a
|
|
1-digit size, and is mandatory. For '%d' and '%x', '0' is always set.
|
|
Always outputs exactly the requested number of characters, even if it's not
|
|
enough to completely print the value.
|
|
Does whatever it wants if the format is invalid. This is really a basic
|
|
function to format output without needing 18 kB of code. */
|
|
GWEAK void vsprintf(char *str, const char *format, va_list args)
|
|
{
|
|
#define in() (c = *format++)
|
|
|
|
const char *digits = "0123456789abcdef";
|
|
int c, len;
|
|
|
|
while(in())
|
|
{
|
|
if(c != '%')
|
|
{
|
|
*str++ = c;
|
|
continue;
|
|
}
|
|
in();
|
|
|
|
/* Length indications (only one character, not '%12d') */
|
|
if(c >= '0' && c <= '9') len = c - '0', in();
|
|
else len = -1;
|
|
|
|
if(c == '%')
|
|
{
|
|
*str++ = '%';
|
|
}
|
|
else if(c == 'd')
|
|
{
|
|
int n = va_arg(args, int);
|
|
if(n < 0) *str++ = '-', n = -n, len--;
|
|
|
|
for(int i = len - 1; i >= 0; i--)
|
|
{
|
|
int m = n / 10;
|
|
str[i] = digits[n - 10 * m];
|
|
n = m;
|
|
}
|
|
str += len;
|
|
}
|
|
else if(c == 'x')
|
|
{
|
|
uint32_t n = va_arg(args, uint32_t);
|
|
|
|
for(int i = len - 1; i >= 0; i--)
|
|
{
|
|
str[i] = digits[n & 0xf];
|
|
n >>= 4;
|
|
}
|
|
str += len;
|
|
}
|
|
else if(c == 'c')
|
|
{
|
|
int c = va_arg(args, int);
|
|
*str++ = c;
|
|
}
|
|
else if(c == 's')
|
|
{
|
|
const char *s = va_arg(args, const char *);
|
|
while(*s && len) *str++ = *s++, len--;
|
|
}
|
|
}
|
|
|
|
*str = 0;
|
|
|
|
#undef in
|
|
#undef out
|
|
}
|
|
|
|
/* sprintf() */
|
|
GWEAK void sprintf(char *str, const char *format, ...)
|
|
{
|
|
va_list args;
|
|
va_start(args, format);
|
|
vsprintf(str, format, args);
|
|
va_end(args);
|
|
}
|