ap_regex.h   [plain text]


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/* Derived from PCRE's pcreposix.h.

            Copyright (c) 1997-2004 University of Cambridge

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/**
 * @file ap_regex.h
 * @brief Apache Regex defines
 */

#ifndef AP_REGEX_H
#define AP_REGEX_H

#include "apr.h"

/* Allow for C++ users */

#ifdef __cplusplus
extern "C" {
#endif

/* Options for ap_regexec: */

#define AP_REG_ICASE    0x01 /** use a case-insensitive match */
#define AP_REG_NEWLINE  0x02 /** don't match newlines against '.' etc */
#define AP_REG_NOTBOL   0x04 /** ^ will not match against start-of-string */
#define AP_REG_NOTEOL   0x08 /** $ will not match against end-of-string */

#define AP_REG_EXTENDED (0)  /** unused */
#define AP_REG_NOSUB    (0)  /** unused */

/* Error values: */
enum {
  AP_REG_ASSERT = 1,  /** internal error ? */
  AP_REG_ESPACE,      /** failed to get memory */
  AP_REG_INVARG,      /** invalid argument */
  AP_REG_NOMATCH      /** match failed */
};

/* The structure representing a compiled regular expression. */
typedef struct {
    void *re_pcre;
    apr_size_t re_nsub;
    apr_size_t re_erroffset;
} ap_regex_t;

/* The structure in which a captured offset is returned. */
typedef struct {
    int rm_so;
    int rm_eo;
} ap_regmatch_t;

/* The functions */

/**
 * Compile a regular expression.
 * @param preg Returned compiled regex
 * @param regex The regular expression string
 * @param cflags Must be zero (currently).
 * @return Zero on success or non-zero on error
 */
AP_DECLARE(int) ap_regcomp(ap_regex_t *preg, const char *regex, int cflags);

/**
 * Match a NUL-terminated string against a pre-compiled regex.
 * @param preg The pre-compiled regex
 * @param string The string to match
 * @param nmatch Provide information regarding the location of any matches
 * @param pmatch Provide information regarding the location of any matches
 * @param eflags Bitwise OR of any of AP_REG_* flags 
 * @return 0 for successful match, #REG_NOMATCH otherwise
 */ 
AP_DECLARE(int) ap_regexec(const ap_regex_t *preg, const char *string,
                           apr_size_t nmatch, ap_regmatch_t *pmatch, int eflags);

/**
 * Return the error code returned by regcomp or regexec into error messages
 * @param errcode the error code returned by regexec or regcomp
 * @param preg The precompiled regex
 * @param errbuf A buffer to store the error in
 * @param errbuf_size The size of the buffer
 */
AP_DECLARE(apr_size_t) ap_regerror(int errcode, const ap_regex_t *preg, 
                                   char *errbuf, apr_size_t errbuf_size);

/** Destroy a pre-compiled regex.
 * @param preg The pre-compiled regex to free.
 */
AP_DECLARE(void) ap_regfree(ap_regex_t *preg);

#ifdef __cplusplus
}   /* extern "C" */
#endif

#endif /* AP_REGEX_T */