/*      $NetBSD: save-flags.c,v 1.2 2024/08/18 20:47:25 christos Exp $  */

/*   -*- buffer-read-only: t -*- vi: set ro:
*
*  DO NOT EDIT THIS FILE   (save-flags.c)
*
*  It has been AutoGen-ed
*  From the definitions    /tmp/.ag-ufBbQe/save-flags.def
*  and the template file   str2enum
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. Neither the name ``Bruce Korb'' nor the name of any other
*    contributor may be used to endorse or promote products derived
*    from this software without specific prior written permission.
*
* str2enum IS PROVIDED BY Bruce Korb ``AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL Bruce Korb OR ANY OTHER CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "save-flags.h"
#include <sys/types.h>
#ifndef MISSING_INTTYPES_H
# include <inttypes.h>
#endif

typedef enum {
   SVFL_BNM_DEFAULT  = 0,
   SVFL_BNM_USAGE    = 1,
   SVFL_BNM_UPDATE   = 2,
   SVFL_COUNT_BNM
} save_flags_enum_t;

static save_flags_enum_t
find_save_flags_bnm(char const * str, size_t len);


#include <sys/types.h>
#include <string.h>
#ifndef NUL
#define NUL '\0'
#endif

/* ANSI-C code produced by gperf version 3.1 */
/* Command-line: gperf save-flags.gp  */
/* Computed positions: -k'' */


# if 0 /* gperf build options: */
// %struct-type
// %language=ANSI-C
// %includes
// %global-table
// %omit-struct-type
// %readonly-tables
// %compare-strncmp
//
// %define slot-name               svfl_name
// %define hash-function-name      save_flags_hash
// %define lookup-function-name    find_save_flags_name
// %define word-array-name         save_flags_table
// %define initializer-suffix      ,SVFL_COUNT_BNM
//
# endif

#include "save-flags.h"
typedef struct {
   char const *    svfl_name;
   save_flags_enum_t svfl_id;
} save_flags_map_t;
#include <string.h>

/* maximum key range = 3, duplicates = 0 */

static unsigned int
save_flags_hash (register const char *str, register size_t len)
{
 (void)str;
 (void)len;
 return len;
}

static const save_flags_map_t save_flags_table[] =
 {
   {"",SVFL_COUNT_BNM}, {"",SVFL_COUNT_BNM},
   {"",SVFL_COUNT_BNM}, {"",SVFL_COUNT_BNM},
   {"",SVFL_COUNT_BNM},
   {"usage",    SVFL_BNM_USAGE},
   {"update",   SVFL_BNM_UPDATE},
   {"default",  SVFL_BNM_DEFAULT}
 };

static inline const save_flags_map_t *
find_save_flags_name (register const char *str, register size_t len)
{
 if (len <= 7 && len >= 5)
   {
     register unsigned int key = (int)save_flags_hash (str, len);

     if (key <= 7)
       {
         register const char *s = save_flags_table[key].svfl_name;

         if (*str == *s && !strncmp (str + 1, s + 1, len - 1) && s[len] == '\0')
           return &save_flags_table[key];
       }
   }
 return 0;
}

/**
* Convert a command (keyword) to a save_flags_enum_t enumeration value.
*
* @param[in] str   a string that should start with a known key word.
* @param[in] len   the provided length of the keyword at \a str.
* @returns the enumeration value.
* If not found, that value is SVFL_COUNT_BNM.
*/
static save_flags_enum_t
find_save_flags_bnm(char const * str, size_t len)
{
   save_flags_map_t const * map;

   map = find_save_flags_name(str, (unsigned int)len);
   if (map != NULL)
       return map->svfl_id;
   /* Check for a partial match */
   {
       /*
        * Indexes of valid save_flags_table entries in sorted order:
        */
       static unsigned int const ix_map[] = {
           7, 6, 5 };
       save_flags_enum_t res = SVFL_COUNT_BNM;
       static int const HI = (sizeof(ix_map) / sizeof(ix_map[0])) - 1;
       int lo = 0;
       int hi = HI;
       int av;
       int cmp;

       for (;;) {
           av  = (hi + lo) / 2;
           map = save_flags_table + ix_map[av];
           cmp = strncmp(map->svfl_name, str, len);
           if (cmp == 0) break;
           if (cmp > 0)
                hi = av - 1;
           else lo = av + 1;
           if (lo > hi)
               return SVFL_COUNT_BNM;
       }
       res = map->svfl_id;
       /*
        * If we have an exact match, accept it.
        */
       if (map->svfl_name[len] == NUL)
           return res;
       /*
        * Check for a duplicate partial match (a partial match
        * with a higher or lower index than "av".
        */
       if (av < HI) {
           map = save_flags_table + ix_map[av + 1];
           if (strncmp(map->svfl_name, str, len) == 0)
               return SVFL_COUNT_BNM;
       }
       if (av > 0) {
           map = save_flags_table + ix_map[av - 1];
           if (strncmp(map->svfl_name, str, len) == 0)
               return SVFL_COUNT_BNM;
       }
       return res;
   }
}

/**
* Convert a string to a save_flags_mask_t mask.
* Bit names prefixed with a hyphen have the bit removed from the mask.
* If the string starts with a '-', '+' or '|' character, then
* the old value is used as a base, otherwise the result mask
* is initialized to zero.  Separating bit names with '+' or '|'
* characters is optional.  By default, the bits are "or"-ed into the
* result.
*
* @param[in] str string with a list of bit names
* @param[in] old previous value, used if \a str starts with a '+' or '-'.
*
* @returns an unsigned integer with the bits set.
*/
save_flags_mask_t
save_flags_str2mask(char const * str, save_flags_mask_t old)
{
   static char const white[] = ", \t\f";
   static char const name_chars[] =
       "adefglpstu"
       "ADEFGLPSTU";

   save_flags_mask_t res = 0;
   int have_data = 0;

   for (;;) {
       save_flags_enum_t val;
       unsigned int val_len;
       unsigned int invert = 0;

       str += strspn(str, white);
       switch (*str) {
       case NUL: return res;
       case '-': case '~':
           invert = 1;
           /* FALLTHROUGH */

       case '+': case '|':
           if (have_data == 0)
               res = old;

           str += 1 + strspn(str + 1, white);
           if (*str == NUL)
               return 0;
       }

       val_len = strspn(str, name_chars);
       if (val_len == 0)
           return 0;
       val = find_save_flags_bnm(str, val_len);
       if (val == SVFL_COUNT_BNM)
           return 0;
       if (invert)
           res &= ~((save_flags_mask_t)1 << val);
       else
           res |= (save_flags_mask_t)1 << val;
       have_data = 1;
       str += val_len;
   }
}
/* end of save-flags.c */

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