SDL/visualtest/src/rwhelper.c

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/* See LICENSE.txt for the full license governing this code. */
/**
* \file rwhelper.c
*
* Source file with some helper functions for working with SDL_RWops.
*/
#include <SDL_test.h>
#include "SDL_visualtest_sut_configparser.h"
#include "SDL_visualtest_rwhelper.h"
void
SDLVisualTest_RWHelperResetBuffer(SDLVisualTest_RWHelperBuffer* buffer)
{
if(!buffer)
{
SDLTest_LogError("buffer argument cannot be NULL");
return;
}
buffer->buffer_pos = 0;
buffer->buffer_width = 0;
}
char
SDLVisualTest_RWHelperReadChar(SDL_RWops* rw, SDLVisualTest_RWHelperBuffer* buffer)
{
if(!rw || !buffer)
return 0;
/* if the buffer has been consumed, we fill it up again */
if(buffer->buffer_pos == buffer->buffer_width)
{
buffer->buffer_width = SDL_RWread(rw, buffer->buffer, 1, RWOPS_BUFFER_LEN);
buffer->buffer_pos = 0;
if(buffer->buffer_width == 0)
return 0;
}
buffer->buffer_pos++;
return buffer->buffer[buffer->buffer_pos - 1];
}
/* does not include new lines in the buffer and adds a trailing null character */
char*
SDLVisualTest_RWHelperReadLine(SDL_RWops* rw, char* str, int size,
SDLVisualTest_RWHelperBuffer* buffer,
char comment_char)
{
char ch;
int current_pos, done;
if(!rw)
{
SDLTest_LogError("rw argument cannot be NULL");
return NULL;
}
if(!str)
{
SDLTest_LogError("str argument cannot be NULL");
return NULL;
}
if(!buffer)
{
SDLTest_LogError("buffer argument cannot be NULL");
return NULL;
}
if(size <= 0)
{
SDLTest_LogError("size argument should be positive");
return NULL;
}
done = 0;
while(!done)
{
/* ignore leading whitespace */
for(ch = SDLVisualTest_RWHelperReadChar(rw, buffer); ch && SDL_isspace(ch);
ch = SDLVisualTest_RWHelperReadChar(rw, buffer));
for(current_pos = 0;
ch && ch != '\n' && ch != '\r' && ch != comment_char;
current_pos++)
{
str[current_pos] = ch;
if(current_pos >= size - 2)
{
current_pos++;
break;
}
ch = SDLVisualTest_RWHelperReadChar(rw, buffer);
}
done = 1;
if(ch == comment_char) /* discard all characters until the next line */
{
do
{
ch = SDLVisualTest_RWHelperReadChar(rw, buffer);
}while(ch && ch != '\n' && ch != '\r');
if(current_pos == 0)
done = 0;
}
}
if(current_pos == 0)
return NULL;
str[current_pos] = '\0';
return str;
}
/* Lines with all whitespace are ignored */
int
SDLVisualTest_RWHelperCountNonEmptyLines(SDL_RWops* rw,
SDLVisualTest_RWHelperBuffer* buffer,
char comment_char)
{
int num_lines = 0;
char str[MAX_SUTOPTION_LINE_LENGTH];
if(!rw)
{
SDLTest_LogError("rw argument cannot be NULL");
return -1;
}
if(!buffer)
{
SDLTest_LogError("buffer argument cannot be NULL");
return -1;
}
while(SDLVisualTest_RWHelperReadLine(rw, str, MAX_SUTOPTION_LINE_LENGTH,
buffer, comment_char))
num_lines++;
return num_lines;
}