ossp-pkg/var/variable.c
#include "internal.h"
int variable(const char* begin, const char* end, const var_config_t* config,
const char nameclass[256], var_cb_t lookup, void* lookup_context,
int force_expand, tokenbuf* result)
{
const char* p = begin;
const char* data;
size_t len, buffer_size;
int rc, rc2;
/* Clear the result tokenbuf to make sure we're in a defined
state. */
init_tokenbuf(result);
/* Expect VARINIT. */
if (p == end || *p != config->varinit)
return 0;
if (++p == end)
return VAR_INCOMPLETE_VARIABLE_SPEC;
/* Try to read the variable name. If that fails, we're parsing a
complex expression. */
rc = varname(p, end, nameclass);
if (rc < 0)
return rc;
else if (rc > 0)
{
rc2 = (*lookup)(lookup_context, p, rc, &data, &len, &buffer_size);
if (rc2 < 0)
return rc2;
else if (rc2 == 0)
{
if (force_expand)
return VAR_UNDEFINED_VARIABLE;
else
{
result->begin = begin;
result->end = begin + 1 + rc;
result->buffer_size = 0;
return 1 + rc;
}
}
else
{
result->begin = data;
result->end = data + len;
result->buffer_size = buffer_size;
return 1 + rc;
}
}
/* OK, we're dealing with a complex expression here. */
rc = expression(p, end, config, nameclass, lookup, lookup_context, force_expand, result);
if (rc > 0)
++rc;
return rc;
}
