code / bp

   1 //
   2 // utils.h - Some utility and printing functions.
   3 //
   4 #pragma once
   5 
   6 #include <err.h>
   7 #include <stdarg.h>
   8 #include <stdbool.h>
   9 #include <stdlib.h> // IWYU pragma: export
  10 #include <string.h> // IWYU pragma: export
  11 #include <unistd.h>
  12 
  13 #ifndef auto
  14 #define auto __auto_type
  15 #endif
  16 
  17 #define S1(x) #x
  18 #define S2(x) S1(x)
  19 
  20 #define require(e, msg)                                                                                                \
  21     ({                                                                                                                 \
  22         __typeof__(e) __expr = e;                                                                                      \
  23         if (_Generic(__expr, int: (ssize_t)__expr < 0, ssize_t: (ssize_t)__expr < 0, default: !__expr))                \
  24             errx(1, __FILE__ ":" S2(__LINE__) ": " msg);                                                               \
  25         __expr;                                                                                                        \
  26     })
  27 
  28 #define When(x, _tag)                                                                                                  \
  29     ((x)->type == _tag                                                                                                 \
  30          ? &(x)->__tagged._tag                                                                                         \
  31          : (errx(1, __FILE__ ":%d This was supposed to be a " #_tag "\n", __LINE__), &(x)->__tagged._tag))
  32 
  33 #ifndef public
  34 #define public __attribute__((visibility("default")))
  35 #endif
  36 
  37 #define new(t) require(calloc(1, sizeof(t)), "`new(" #t ")` allocation failure")
  38 #define checked_strdup(s) require(strdup(s), "`checked_strdup(" #s ")` allocation failure")
  39 #define grow(arr, n) require(realloc(arr, sizeof(arr[0]) * (n)), "`grow(" #arr ", " #n ")` allocation failure")
  40 
  41 #define streq(a, b) (strcmp(a, b) == 0)
  42 
  43 __attribute__((nonnull(1))) char unescapechar(const char *escaped, const char **after, const char *end);
  44 __attribute__((pure, nonnull)) const char *after_name(const char *str, const char *end);
  45 __attribute__((pure, nonnull, returns_nonnull)) const char *after_spaces(const char *str, bool skip_nl,
  46                                                                          const char *end);
  47 __attribute__((nonnull)) bool matchchar(const char **str, char c, bool skip_nl, const char *end);
  48 __attribute__((nonnull)) bool matchstr(const char **str, const char *target, bool skip_nl, const char *end);
  49 __attribute__((nonnull)) void delete(void *p);
  50 
  51 // vim: ts=4 sw=0 et cino=L2,l1,(0,W4,m1,\:0