parsehelper.c
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/* See COPYING.txt for the full license governing this code. */
/**
* \file parsehelper.c
*
* Source file with some helper functions for parsing strings.
*/
#include <SDL_test.h>
#include "SDL_visualtest_harness_argparser.h"
/* this function uses a DFA to count the number of tokens in an agruments string.
state 0 is taken to be the start and end state. State 1 handles a double quoted
argument and state 2 handles unquoted arguments. */
static int
CountTokens(char* args)
{
int index, num_tokens;
int state; /* current state of the DFA */
if(!args)
return -1;
index = 0;
state = 0;
num_tokens = 0;
while(args[index])
{
char ch = args[index];
switch(state)
{
case 0:
if(ch == '\"')
{
state = 1;
num_tokens++;
}
else if(!SDL_isspace(ch))
{
state = 2;
num_tokens++;
}
break;
case 1:
if(ch == '\"')
{
state = 0;
}
break;
case 2:
if(SDL_isspace(ch))
{
state = 0;
}
break;
}
index++;
}
return num_tokens;
}
/* - size of tokens is num_tokens + 1
- uses the same DFA used in CountTokens() to split args into an array of strings */
static int
TokenizeHelper(char* str, char** tokens, int num_tokens, int max_token_len)
{
int index, state, done, st_index, token_index;
if(!str)
{
SDLTest_LogError("str argument cannot be NULL");
return 0;
}
if(!tokens)
{
SDLTest_LogError("tokens argument cannot be NULL");
return 0;
}
if(num_tokens <= 0)
{
SDLTest_LogError("num_tokens argument must be positive");
return 0;
}
if(max_token_len <= 0)
{
SDLTest_LogError("max_token_len argument must be positive");
return 0;
}
/* allocate memory for the tokens */
tokens[num_tokens] = NULL;
for(index = 0; index < num_tokens; index++)
{
tokens[index] = (char*)SDL_malloc(max_token_len);
if(!tokens[index])
{
int i;
SDLTest_LogError("malloc() failed.");
for(i = 0; i < index; i++)
SDL_free(tokens[i]);
return 0;
}
tokens[index][0] = '\0';
}
/* copy the tokens into the array */
st_index = 0;
index = 0;
token_index = 0;
state = 0;
done = 0;
while(!done)
{
char ch = str[index];
switch(state)
{
case 0:
if(ch == '\"')
{
state = 1;
st_index = index + 1;
}
else if(!ch)
done = 1;
else if(ch && !SDL_isspace(ch))
{
state = 2;
st_index = index;
}
break;
case 1:
if(ch == '\"')
{
int i;
state = 0;
for(i = st_index; i < index; i++)
{
tokens[token_index][i - st_index] = str[i];
}
tokens[token_index][i - st_index] = '\0';
token_index++;
}
else if(!ch)
{
SDLTest_LogError("Parsing Error!");
done = 1;
}
break;
case 2:
if(!ch)
done = 1;
if(SDL_isspace(ch) || !ch)
{
int i;
state = 0;
for(i = st_index; i < index; i++)
{
tokens[token_index][i - st_index] = str[i];
}
tokens[token_index][i - st_index] = '\0';
token_index++;
}
break;
}
index++;
}
return 1;
}
char**
SDLVisualTest_Tokenize(char* str, int max_token_len)
{
int num_tokens;
char** tokens;
if(!str)
{
SDLTest_LogError("str argument cannot be NULL");
return NULL;
}
if(max_token_len <= 0)
{
SDLTest_LogError("max_token_len argument must be positive");
return NULL;
}
num_tokens = CountTokens(str);
if(num_tokens == 0)
return NULL;
tokens = (char**)SDL_malloc(sizeof(char*) * (num_tokens + 1));
if(!TokenizeHelper(str, tokens, num_tokens, max_token_len))
{
SDLTest_LogError("TokenizeHelper() failed");
SDL_free(tokens);
return NULL;
}
return tokens;
}
char**
SDLVisualTest_ParseArgsToArgv(char* args)
{
char** argv;
int num_tokens;
num_tokens = CountTokens(args);
if(num_tokens == 0)
return NULL;
/* allocate space for arguments */
argv = (char**)SDL_malloc((num_tokens + 2) * sizeof(char*));
if(!argv)
{
SDLTest_LogError("malloc() failed.");
return NULL;
}
/* tokenize */
if(!TokenizeHelper(args, argv + 1, num_tokens, MAX_SUT_ARGS_LEN))
{
SDLTest_LogError("TokenizeHelper() failed");
SDL_free(argv);
return NULL;
}
argv[0] = NULL;
return argv;
}