src/basic/string-table.h

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #pragma once
   4
   5 #include <errno.h>
   6 #include <stddef.h>
   7 #include <stdio.h>
   8 #include <sys/types.h>
   9
  10 #include "macro.h"
  11 #include "parse-util.h"
  12 #include "string-util.h"
  13
  14 ssize_t string_table_lookup(const char * const *table, size_t len, const char *key);
  15
  16 /* For basic lookup tables with strictly enumerated entries */
  17 #define _DEFINE_STRING_TABLE_LOOKUP_TO_STRING(name,type,scope)          \
  18         scope const char *name##_to_string(type i) {                    \
  19                 if (i < 0 || i >= (type) ELEMENTSOF(name##_table))      \
  20                         return NULL;                                    \
  21                 return name##_table[i];                                 \
  22         }
  23
  24 #define _DEFINE_STRING_TABLE_LOOKUP_FROM_STRING(name,type,scope)        \
  25         scope type name##_from_string(const char *s) {                  \
  26                 return (type) string_table_lookup(name##_table, ELEMENTSOF(name##_table), s); \
  27         }
  28
  29 #define _DEFINE_STRING_TABLE_LOOKUP_FROM_STRING_WITH_BOOLEAN(name,type,yes,scope) \
  30         scope type name##_from_string(const char *s) {                  \
  31                 int b;                                                  \
  32                 if (!s)                                                 \
  33                         return -1;                                      \
  34                 b = parse_boolean(s);                                   \
  35                 if (b == 0)                                             \
  36                         return (type) 0;                                \
  37                 else if (b > 0)                                         \
  38                         return yes;                                     \
  39                 return (type) string_table_lookup(name##_table, ELEMENTSOF(name##_table), s); \
  40         }
  41
  42 #define _DEFINE_STRING_TABLE_LOOKUP_TO_STRING_FALLBACK(name,type,max,scope) \
  43         scope int name##_to_string_alloc(type i, char **str) {          \
  44                 char *s;                                                \
  45                 if (i < 0 || i > max)                                   \
  46                         return -ERANGE;                                 \
  47                 if (i < (type) ELEMENTSOF(name##_table) && name##_table[i]) { \
  48                         s = strdup(name##_table[i]);                    \
  49                         if (!s)                                         \
  50                                 return -ENOMEM;                         \
  51                 } else {                                                \
  52                         if (asprintf(&s, "%i", i) < 0)                  \
  53                                 return -ENOMEM;                         \
  54                 }                                                       \
  55                 *str = s;                                               \
  56                 return 0;                                               \
  57         }
  58
  59 #define _DEFINE_STRING_TABLE_LOOKUP_FROM_STRING_FALLBACK(name,type,max,scope) \
  60         scope type name##_from_string(const char *s) {                  \
  61                 unsigned u = 0;                                         \
  62                 type i;                                                 \
  63                 if (!s)                                                 \
  64                         return (type) -1;                               \
  65                 i = (type) string_table_lookup(name##_table, ELEMENTSOF(name##_table), s); \
  66                 if (i >= 0)                                             \
  67                         return i;                                       \
  68                 if (safe_atou(s, &u) >= 0 && u <= max)                  \
  69                         return (type) u;                                \
  70                 return (type) -1;                                       \
  71         }                                                               \
  72
  73 #define _DEFINE_STRING_TABLE_LOOKUP(name,type,scope)                    \
  74         _DEFINE_STRING_TABLE_LOOKUP_TO_STRING(name,type,scope)          \
  75         _DEFINE_STRING_TABLE_LOOKUP_FROM_STRING(name,type,scope)
  76
  77 #define _DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN(name,type,yes,scope)   \
  78         _DEFINE_STRING_TABLE_LOOKUP_TO_STRING(name,type,scope)          \
  79         _DEFINE_STRING_TABLE_LOOKUP_FROM_STRING_WITH_BOOLEAN(name,type,yes,scope)
  80
  81 #define DEFINE_STRING_TABLE_LOOKUP(name,type) _DEFINE_STRING_TABLE_LOOKUP(name,type,)
  82 #define DEFINE_PRIVATE_STRING_TABLE_LOOKUP(name,type) _DEFINE_STRING_TABLE_LOOKUP(name,type,static)
  83 #define DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(name,type) _DEFINE_STRING_TABLE_LOOKUP_TO_STRING(name,type,static)
  84 #define DEFINE_PRIVATE_STRING_TABLE_LOOKUP_FROM_STRING(name,type) _DEFINE_STRING_TABLE_LOOKUP_FROM_STRING(name,type,static)
  85
  86 #define DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN(name,type,yes) _DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN(name,type,yes,)
  87
  88 /* For string conversions where numbers are also acceptable */
  89 #define DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(name,type,max)         \
  90         _DEFINE_STRING_TABLE_LOOKUP_TO_STRING_FALLBACK(name,type,max,)  \
  91         _DEFINE_STRING_TABLE_LOOKUP_FROM_STRING_FALLBACK(name,type,max,)
  92
  93 #define DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING_FALLBACK(name,type,max) \
  94         _DEFINE_STRING_TABLE_LOOKUP_TO_STRING_FALLBACK(name,type,max,static)
  95 #define DEFINE_PRIVATE_STRING_TABLE_LOOKUP_FROM_STRING_FALLBACK(name,type,max) \
  96         _DEFINE_STRING_TABLE_LOOKUP_FROM_STRING_FALLBACK(name,type,max,static)
  97
  98 #define DUMP_STRING_TABLE(name,type,max)                                \
  99         do {                                                            \
 100                 type _k;                                                \
 101                 flockfile(stdout);                                      \
 102                 for (_k = 0; _k < (max); _k++) {                        \
 103                         const char *_t;                                 \
 104                         _t = name##_to_string(_k);                      \
 105                         if (!_t)                                        \
 106                                 continue;                               \
 107                         fputs_unlocked(_t, stdout);                     \
 108                         fputc_unlocked('\n', stdout);                   \
 109                 }                                                       \
 110                 funlockfile(stdout);                                    \
 111         } while(false)