Description
Source
Call Graph
Start Line: 293
signed int vsnprintf(char *pStr, size_t length, const char *pFormat, va_list ap)
{
char fill;
unsigned char width;
signed int num = 0;
signed int size = 0;
// Clear the string
if (pStr) {
*pStr = 0;
}
// Phase string
while (*pFormat != 0 && size < length) {
// Normal character
if (*pFormat != '%') {
*pStr++ = *pFormat++;
size++;
}
// Escaped '%'
else if (*(pFormat+1) == '%') {
*pStr++ = '%';
pFormat += 2;
size++;
}
// Token delimiter
else {
fill = ' ';
width = 0;
pFormat++;
// Parse filler
if (*pFormat == '0') {
fill = '0';
pFormat++;
}
// Parse width
while ((*pFormat >= '0') && (*pFormat <= '9')) {
width = (width*10) + *pFormat-'0';
pFormat++;
}
// Check if there is enough space
if (size + width > length) {
width = length - size;
}
// Parse type
switch (*pFormat) {
case 'd':
case 'i': num = PutSignedInt(pStr, fill, width, va_arg(ap, signed int)); break;
case 'u': num = PutUnsignedInt(pStr, fill, width, va_arg(ap, unsigned int)); break;
case 'x': num = PutHexa(pStr, fill, width, 0, va_arg(ap, unsigned int)); break;
case 'X': num = PutHexa(pStr, fill, width, 1, va_arg(ap, unsigned int)); break;
case 's': num = PutString(pStr, va_arg(ap, char *)); break;
case 'c': num = PutChar(pStr, va_arg(ap, unsigned int)); break;
default:
return EOF;
}
pFormat++;
pStr += num;
size += num;
}
}
// NULL-terminated (final \0 is not counted)
if (size < length) {
*pStr = 0;
}
else {
*(--pStr) = 0;
size--;
}
return size;
}