ossp-pkg/var/cut-out-offset.c
#include "internal.h"
size_t tokenbuf2int(tokenbuf* number)
{
const char* p;
size_t num = 0;
for (p = number->begin; p != number->end; ++p)
{
num *= 10;
num += *p - '0';
}
return num;
}
int cut_out_offset(tokenbuf* data, tokenbuf* number1, tokenbuf* number2, int isrange)
{
tokenbuf res;
const char* p;
size_t num1 = tokenbuf2int(number1);
size_t num2 = tokenbuf2int(number2);
/* Determine begin of result string. */
if ((data->end - data->begin) < num1)
return VAR_OFFSET_OUT_OF_BOUNDS;
else
p = data->begin + num1;
/* If num2 is zero, we copy the rest from there. */
if (num2 == 0)
{
if (!assign_to_tokenbuf(&res, p, data->end - p))
return VAR_OUT_OF_MEMORY;
}
else /* OK, then use num2. */
{
if (isrange)
{
if ((p + num2) > data->end)
return VAR_RANGE_OUT_OF_BOUNDS;
if (!assign_to_tokenbuf(&res, p, num2))
return VAR_OUT_OF_MEMORY;
}
else
{
if (num2 < num1)
return VAR_OFFSET_LOGIC_ERROR;
if ((data->begin + num2) > data->end)
return VAR_RANGE_OUT_OF_BOUNDS;
if (!assign_to_tokenbuf(&res, p, (data->begin + num2) - p))
return VAR_OUT_OF_MEMORY;
}
}
free_tokenbuf(data);
move_tokenbuf(&res, data);
return VAR_OK;
}
