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296 lines
8.5 KiB
C
296 lines
8.5 KiB
C
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/*
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* THIS CODE IS SPECIFICALLY EXEMPTED FROM THE NCURSES PACKAGE COPYRIGHT.
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* You may freely copy it for use as a template for your own field types.
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* If you develop a field type that might be of general use, please send
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* it back to the ncurses maintainers for inclusion in the next version.
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*/
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/***************************************************************************
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* *
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* Author : Juergen Pfeifer, juergen.pfeifer@gmx.net *
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* *
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***************************************************************************/
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#include "form.priv.h"
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MODULE_ID("$Id: fty_enum.c,v 1.15 2000/12/09 23:46:12 tom Exp $")
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typedef struct {
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char **kwds;
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int count;
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bool checkcase;
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bool checkunique;
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} enumARG;
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/*---------------------------------------------------------------------------
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| Facility : libnform
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| Function : static void *Make_Enum_Type( va_list * ap )
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| Description : Allocate structure for enumeration type argument.
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| Return Values : Pointer to argument structure or NULL on error
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+--------------------------------------------------------------------------*/
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static void *Make_Enum_Type(va_list * ap)
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{
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enumARG *argp = (enumARG *)malloc(sizeof(enumARG));
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if (argp)
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{
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int cnt = 0;
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char **kp = (char **)0;
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int ccase, cunique;
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argp->kwds = va_arg(*ap,char **);
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ccase = va_arg(*ap,int);
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cunique = va_arg(*ap,int);
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argp->checkcase = ccase ? TRUE : FALSE;
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argp->checkunique = cunique ? TRUE : FALSE;
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kp = argp->kwds;
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while( kp && (*kp++) ) cnt++;
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argp->count = cnt;
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}
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return (void *)argp;
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}
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/*---------------------------------------------------------------------------
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| Facility : libnform
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| Function : static void *Copy_Enum_Type( const void * argp )
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| Description : Copy structure for enumeration type argument.
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| Return Values : Pointer to argument structure or NULL on error.
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+--------------------------------------------------------------------------*/
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static void *Copy_Enum_Type(const void * argp)
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{
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enumARG *result = (enumARG *)0;
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if (argp)
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{
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const enumARG *ap = (const enumARG *)argp;
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result = (enumARG *)malloc(sizeof(enumARG));
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if (result)
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*result = *ap;
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}
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return (void *)result;
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}
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/*---------------------------------------------------------------------------
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| Facility : libnform
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| Function : static void Free_Enum_Type( void * argp )
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| Description : Free structure for enumeration type argument.
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| Return Values : -
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+--------------------------------------------------------------------------*/
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static void Free_Enum_Type(void * argp)
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{
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if (argp)
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free(argp);
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}
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#define SKIP_SPACE(x) while(((*(x))!='\0') && (is_blank(*(x)))) (x)++
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#define NOMATCH 0
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#define PARTIAL 1
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#define EXACT 2
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/*---------------------------------------------------------------------------
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| Facility : libnform
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| Function : static int Compare(const unsigned char * s,
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| const unsigned char * buf,
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| bool ccase )
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| Description : Check wether or not the text in 'buf' matches the
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| text in 's', at least partial.
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| Return Values : NOMATCH - buffer doesn't match
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| PARTIAL - buffer matches partially
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| EXACT - buffer matches exactly
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+--------------------------------------------------------------------------*/
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static int Compare(const unsigned char *s, const unsigned char *buf,
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bool ccase)
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{
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SKIP_SPACE(buf); /* Skip leading spaces in both texts */
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SKIP_SPACE(s);
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if (*buf=='\0')
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{
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return (((*s)!='\0') ? NOMATCH : EXACT);
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}
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else
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{
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if (ccase)
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{
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while(*s++ == *buf)
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{
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if (*buf++=='\0') return EXACT;
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}
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}
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else
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{
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while(toupper(*s++)==toupper(*buf))
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{
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if (*buf++=='\0') return EXACT;
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}
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}
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}
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/* At this location buf points to the first character where it no longer
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matches with s. So if only blanks are following, we have a partial
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match otherwise there is no match */
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SKIP_SPACE(buf);
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if (*buf)
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return NOMATCH;
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/* If it happens that the reference buffer is at its end, the partial
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match is actually an exact match. */
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return ((s[-1]!='\0') ? PARTIAL : EXACT);
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}
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/*---------------------------------------------------------------------------
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| Facility : libnform
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| Function : static bool Check_Enum_Field(
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| FIELD * field,
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| const void * argp)
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| Description : Validate buffer content to be a valid enumeration value
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| Return Values : TRUE - field is valid
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| FALSE - field is invalid
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+--------------------------------------------------------------------------*/
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static bool Check_Enum_Field(FIELD * field, const void * argp)
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{
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char **kwds = ((const enumARG *)argp)->kwds;
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bool ccase = ((const enumARG *)argp)->checkcase;
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bool unique = ((const enumARG *)argp)->checkunique;
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unsigned char *bp = (unsigned char *)field_buffer(field,0);
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char *s, *t, *p;
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int res;
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while( kwds && (s=(*kwds++)) )
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{
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if ((res=Compare((unsigned char *)s,bp,ccase))!=NOMATCH)
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{
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p=t=s; /* t is at least a partial match */
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if ((unique && res!=EXACT))
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{
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while( kwds && (p = *kwds++) )
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{
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if ((res=Compare((unsigned char *)p,bp,ccase))!=NOMATCH)
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{
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if (res==EXACT)
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{
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t = p;
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break;
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}
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else
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t = (char *)0;
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}
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}
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}
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if (t)
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{
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set_field_buffer(field,0,t);
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return TRUE;
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}
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if (!p)
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break;
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}
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}
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return FALSE;
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}
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static const char *dummy[] = { (char *)0 };
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/*---------------------------------------------------------------------------
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| Facility : libnform
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| Function : static bool Next_Enum(FIELD * field,
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| const void * argp)
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| Description : Check for the next enumeration value
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| Return Values : TRUE - next value found and loaded
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| FALSE - no next value loaded
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+--------------------------------------------------------------------------*/
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static bool Next_Enum(FIELD * field, const void * argp)
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{
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const enumARG *args = (const enumARG *)argp;
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char **kwds = args->kwds;
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bool ccase = args->checkcase;
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int cnt = args->count;
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unsigned char *bp = (unsigned char *)field_buffer(field,0);
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if (kwds) {
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while(cnt--)
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{
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if (Compare((unsigned char *)(*kwds++),bp,ccase)==EXACT)
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break;
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}
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if (cnt<=0)
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kwds = args->kwds;
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if ((cnt>=0) || (Compare((const unsigned char *)dummy,bp,ccase)==EXACT))
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{
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set_field_buffer(field,0,*kwds);
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return TRUE;
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}
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}
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return FALSE;
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}
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/*---------------------------------------------------------------------------
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| Facility : libnform
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| Function : static bool Previous_Enum(
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| FIELD * field,
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| const void * argp)
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| Description : Check for the previous enumeration value
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| Return Values : TRUE - previous value found and loaded
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| FALSE - no previous value loaded
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+--------------------------------------------------------------------------*/
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static bool Previous_Enum(FIELD * field, const void * argp)
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{
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const enumARG *args = (const enumARG *)argp;
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int cnt = args->count;
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char **kwds = &args->kwds[cnt-1];
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bool ccase = args->checkcase;
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unsigned char *bp = (unsigned char *)field_buffer(field,0);
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if (kwds) {
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while(cnt--)
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{
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if (Compare((unsigned char *)(*kwds--),bp,ccase)==EXACT)
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break;
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}
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if (cnt<=0)
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kwds = &args->kwds[args->count-1];
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if ((cnt>=0) || (Compare((const unsigned char *)dummy,bp,ccase)==EXACT))
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{
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set_field_buffer(field,0,*kwds);
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return TRUE;
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}
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}
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return FALSE;
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}
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static FIELDTYPE typeENUM = {
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_HAS_ARGS | _HAS_CHOICE | _RESIDENT,
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1, /* this is mutable, so we can't be const */
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(FIELDTYPE *)0,
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(FIELDTYPE *)0,
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Make_Enum_Type,
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Copy_Enum_Type,
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Free_Enum_Type,
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Check_Enum_Field,
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NULL,
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Next_Enum,
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Previous_Enum
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};
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NCURSES_EXPORT_VAR(FIELDTYPE*) TYPE_ENUM = &typeENUM;
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/* fty_enum.c ends here */
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