/* * THIS CODE IS SPECIFICALLY EXEMPTED FROM THE NCURSES PACKAGE COPYRIGHT. * You may freely copy it for use as a template for your own field types. * If you develop a field type that might be of general use, please send * it back to the ncurses maintainers for inclusion in the next version. */ /*************************************************************************** * * * Author : Juergen Pfeifer, juergen.pfeifer@gmx.net * * * ***************************************************************************/ #include "form.priv.h" MODULE_ID("$Id$") #if HAVE_REGEX_H_FUNCS /* We prefer POSIX regex */ #include <regex.h> typedef struct { regex_t *pRegExp; unsigned long *refCount; } RegExp_Arg; #elif HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS #undef RETURN static int reg_errno; static char *RegEx_Init(char *instring) { reg_errno = 0; return instring; } static char *RegEx_Error(int code) { reg_errno = code; return 0; } #define INIT register char *sp = RegEx_Init(instring); #define GETC() (*sp++) #define PEEKC() (*sp) #define UNGETC(c) (--sp) #define RETURN(c) return(c) #define ERROR(c) return RegEx_Error(c) #if HAVE_REGEXP_H_FUNCS #include <regexp.h> #else #include <regexpr.h> #endif typedef struct { char *compiled_expression; unsigned long *refCount; } RegExp_Arg; /* Maximum Length we allow for a compiled regular expression */ #define MAX_RX_LEN (2048) #define RX_INCREMENT (256) #endif /*--------------------------------------------------------------------------- | Facility : libnform | Function : static void *Make_RegularExpression_Type(va_list * ap) | | Description : Allocate structure for regex type argument. | | Return Values : Pointer to argument structure or NULL on error +--------------------------------------------------------------------------*/ static void *Make_RegularExpression_Type(va_list * ap) { #if HAVE_REGEX_H_FUNCS char *rx = va_arg(*ap,char *); RegExp_Arg *preg; preg = (RegExp_Arg*)malloc(sizeof(RegExp_Arg)); if (preg) { if (((preg->pRegExp = (regex_t*)malloc(sizeof(regex_t))) != (regex_t*)0) && !regcomp(preg->pRegExp,rx, (REG_EXTENDED | REG_NOSUB | REG_NEWLINE) )) { preg->refCount = (unsigned long *)malloc(sizeof(unsigned long)); *(preg->refCount) = 1; } else { if (preg->pRegExp) free(preg->pRegExp); free(preg); preg = (RegExp_Arg*)0; } } return((void *)preg); #elif HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS char *rx = va_arg(*ap,char *); RegExp_Arg *pArg; pArg = (RegExp_Arg *)malloc(sizeof(RegExp_Arg)); if (pArg) { int blen = RX_INCREMENT; pArg->compiled_expression = NULL; pArg->refCount = (unsigned long *)malloc(sizeof(unsigned long)); *(pArg->refCount) = 1; do { char *buf = (char *)malloc(blen); if (buf) { #if HAVE_REGEXP_H_FUNCS char *last_pos = compile (rx, buf, &buf[blen], '\0'); #else /* HAVE_REGEXPR_H_FUNCS */ char *last_pos = compile (rx, buf, &buf[blen]); #endif if (reg_errno) { free(buf); if (reg_errno==50) blen += RX_INCREMENT; else { free(pArg); pArg = NULL; break; } } else { pArg->compiled_expression = buf; break; } } } while( blen <= MAX_RX_LEN ); } if (pArg && !pArg->compiled_expression) { free(pArg); pArg = NULL; } return (void *)pArg; #else ap=0; /* Silence unused parameter warning. */ return 0; #endif } /*--------------------------------------------------------------------------- | Facility : libnform | Function : static void *Copy_RegularExpression_Type( | const void * argp) | | Description : Copy structure for regex type argument. | | Return Values : Pointer to argument structure or NULL on error. +--------------------------------------------------------------------------*/ static void *Copy_RegularExpression_Type(const void * argp) { #if (HAVE_REGEX_H_FUNCS | HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS) const RegExp_Arg *ap = (const RegExp_Arg *)argp; const RegExp_Arg *result = (const RegExp_Arg *)0; if (ap) { *(ap->refCount) += 1; result = ap; } return (void *)result; #else argp=0; /* Silence unused parameter warning. */ return 0; #endif } /*--------------------------------------------------------------------------- | Facility : libnform | Function : static void Free_RegularExpression_Type(void * argp) | | Description : Free structure for regex type argument. | | Return Values : - +--------------------------------------------------------------------------*/ static void Free_RegularExpression_Type(void * argp) { #if HAVE_REGEX_H_FUNCS | HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS RegExp_Arg *ap = (RegExp_Arg *)argp; if (ap) { if (--(*(ap->refCount)) == 0) { #if HAVE_REGEX_H_FUNCS if (ap->pRegExp) { free(ap->refCount); regfree(ap->pRegExp); } #elif HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS if (ap->compiled_expression) { free(ap->refCount); free(ap->compiled_expression); } #endif free(ap); } } #else argp=0; /* Silence unused parameter warning. */ #endif } /*--------------------------------------------------------------------------- | Facility : libnform | Function : static bool Check_RegularExpression_Field( | FIELD * field, | const void * argp) | | Description : Validate buffer content to be a valid regular expression | | Return Values : TRUE - field is valid | FALSE - field is invalid +--------------------------------------------------------------------------*/ static bool Check_RegularExpression_Field(FIELD * field, const void * argp) { bool match = FALSE; #if HAVE_REGEX_H_FUNCS const RegExp_Arg *ap = (const RegExp_Arg*)argp; if (ap && ap->pRegExp) match = (regexec(ap->pRegExp,field_buffer(field,0),0,NULL,0) ? FALSE:TRUE); #elif HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS RegExp_Arg *ap = (RegExp_Arg *)argp; if (ap && ap->compiled_expression) match = (step(field_buffer(field,0),ap->compiled_expression) ? TRUE:FALSE); #else argp=0; /* Silence unused parameter warning. */ field=0; /* Silence unused parameter warning. */ #endif return match; } static FIELDTYPE typeREGEXP = { _HAS_ARGS | _RESIDENT, 1, /* this is mutable, so we can't be const */ (FIELDTYPE *)0, (FIELDTYPE *)0, Make_RegularExpression_Type, Copy_RegularExpression_Type, Free_RegularExpression_Type, Check_RegularExpression_Field, NULL, NULL, NULL }; FIELDTYPE* TYPE_REGEXP = &typeREGEXP; /* fty_regex.c ends here */