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#include <Eina.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <pcreposix.h>
inline static int
_is_escapable(char c)
{
switch (c)
{
case '[': case '|': case '(': case ')': case '*': case '?':
case '!': case '^': case '$': case '.': case '+': case '\\':
return 1;
default:
return 0;
}
}
inline static char *
_wildcards_to_regex(const char *pattern, int flags)
{
// Counts how many additional chars needs to be allocated
int pattern_length = strlen(pattern);
int count = 2; // starts with '^' and ends with '$'
for (int j = 0; j < pattern_length; ++j)
{
if (pattern[j] == '\\')
{
if (flags & FNM_NOESCAPE) count++;
else count += 2;
}
else if ((pattern[j] == '*') || (pattern[j] == '?'))
{
if (flags & FNM_PATHNAME)
{
if (flags & FNM_PERIOD) // PATHNAME + PERIOD
{
if (pattern[j] == '*')
{
if (j == 0) count += 10;
else if (pattern[j - 1] == '/') count += 10;
else count += 5;
}
else if ((j == 0) || (pattern[j - 1] == '/')) count += 10;
else count += 4;
}
else if (pattern[j] == '*') count += 5; // PATHNAME
else count += 4;
}
else if (flags & FNM_PERIOD)
{
if (j == 0) // period at init
{
if (pattern[j] == '*') count += 5;
else count += 4;
}
// period at other places
else if (pattern[j] == '*') count += 2;
else count++;
}
else if (pattern[j] == '*') count += 2; // NORMAL
else count++;
}
else if (pattern[j] == '.') count += 4;
else count++; // OTHERS
}
int reg_length = pattern_length + count + 1;
// Translates wildcards to regex
char *reg_pattern = calloc(sizeof(char), reg_length);
if (reg_pattern == NULL) exit(ENOMEM);
reg_pattern[0] = '^';
int i = 1;
for (int j = 0; j < pattern_length; ++j)
{
if (pattern[j] == '\\')
{
if (flags & FNM_NOESCAPE)
reg_pattern[i++] = '/';
else if (_is_escapable(pattern[j + 1]))
{
reg_pattern[i++] = '\\';
reg_pattern[i++] = pattern[++j];
}
else
{
reg_pattern[i++] = '\\';
reg_pattern[i++] = '/';
}
}
else if ((pattern[j] == '*') || (pattern[j] == '?'))
{
if (flags & FNM_PATHNAME)
{
if (flags & FNM_PERIOD) // PATHNAME + PERIOD
{
if (pattern[j] == '*')
{
if ( (j == 0) || (pattern[j - 1] == '/') )
{
strcpy_s(reg_pattern + i,
reg_length - i,
"[^\\.][^/]*");
i += 10;
}
else
{
strcpy_s(reg_pattern + i,
reg_length - i,
"[^/]*");
i += 5;
}
}
else if (j == 0)
{
strcpy_s(reg_pattern + i,
reg_length - i,
"[^\\.][^/]?");
i += 10;
}
else if (pattern[j - 1] == '/')
{
strcpy_s(reg_pattern + i,
reg_length - i,
"[^\\.][^/]?");
i += 10;
}
else
{
strcpy_s(reg_pattern + i,
reg_length - i,
"[^/]");
i += 4;
}
}
else if (pattern[j] == '*') // PATHNAME
{
strcpy_s(reg_pattern + i,
reg_length - i,
"[^/]*");
i += 5;
}
else
{
strcpy_s(reg_pattern + i,
reg_length - i,
"[^/]");
i += 4;
}
}
else if (flags & FNM_PERIOD)
{
if (j == 0) // period at init
{
if (pattern[j] == '*')
{
strcpy_s(reg_pattern + i,
reg_length - i,
"[\\.]*");
i += 5;
}
else
{
strcpy_s(reg_pattern + i,
reg_length - i,
"[\\.]");
i += 4;
}
}
else if (pattern[j] == '*') // period at other places
{
strcpy_s(reg_pattern + i,
reg_length - i,
".*");
i += 2;
}
else
reg_pattern[i++] = '.';
}
else if (pattern[j] == '*') // NORMAL
{
strcpy_s(reg_pattern + i,
reg_length - i,
".*");
i += 2;
}
else
{
strcpy_s(reg_pattern + i,
reg_length - i,
".");
i++;
}
}
else if (pattern[j] == '.')
{
strcpy_s(reg_pattern + i,
reg_length - i,
"[\\.]");
i += 4;
}
else reg_pattern[i++] = pattern[j]; // OTHERS
}
strcpy_s(reg_pattern + i,
reg_length - i,
"$");
return reg_pattern;
}
EINA_API int
eina_fnmatch(const char *pattern, const char *string, int flags)
{
// Converts wildcard pattern to regex pattern
char *reg_pattern = _wildcards_to_regex(pattern, flags);
// Configures regex
int regex_flags = (REG_NOSUB) // Report only success/fail in regexec()
|| ((flags & FNM_CASEFOLD) ? REG_ICASE : 0);
// Compiles regex
regex_t regex;
if (regcomp(®ex, reg_pattern, regex_flags))
{
regfree(®ex);
return FNM_NOMATCH;
}
// Replaces '\\' with '/'
int string_length = strlen(string);
char *unix_path = calloc(sizeof(char), string_length + 1);
if (unix_path == NULL) exit(ENOMEM);
unix_path[string_length] = '\0';
for (int i = 0; i < string_length; ++i)
unix_path[i] = (string[i] == '\\') ? '/' : string[i];
// Executes regex
int result = regexec(®ex, unix_path, 0, NULL, 0);
// Cleans-up and returns
free(unix_path);
free(reg_pattern);
regfree(®ex);
return result ? FNM_NOMATCH : 0;
}
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