code / bb

   1 //
   2 // utils.h
   3 // Copyright 2021 Bruce Hill
   4 // Released under the MIT license with the Commons Clause
   5 //
   6 // This file contains some definitions of some utility macros and functions.
   7 //
   8 
   9 #ifndef FILE_UTILS__H
  10 #define FILE_UTILS__H
  11 
  12 #include <string.h>
  13 
  14 #ifndef streq
  15 #define streq(a, b) (strcmp(a, b) == 0)
  16 #endif
  17 
  18 #define MAX(a, b) ((a) < (b) ? (b) : (a))
  19 #define MIN(a, b) ((a) > (b) ? (b) : (a))
  20 
  21 // Platform-dependent time strucutre accessors:
  22 #ifdef __APPLE__
  23 #define get_mtime(s) (s).st_mtimespec
  24 #define get_atime(s) (s).st_atimespec
  25 #define get_ctime(s) (s).st_ctimespec
  26 #else
  27 #define get_mtime(s) (s).st_mtim
  28 #define get_atime(s) (s).st_atim
  29 #define get_ctime(s) (s).st_ctim
  30 #endif
  31 
  32 // Entry macros
  33 #define IS_SELECTED(e) (((e)->selected.atme) != NULL)
  34 #define IS_VIEWED(e) ((e)->index >= 0)
  35 #define IS_LOADED(e) ((e)->hash.atme != NULL)
  36 
  37 #define E_ISDIR(e) (S_ISDIR(S_ISLNK((e)->info.st_mode) ? (e)->linkedmode : (e)->info.st_mode))
  38 
  39 // Linked list macros
  40 #define LL_PREPEND(head, node, name)                                                                                   \
  41     do {                                                                                                               \
  42         ((node)->name).atme = &(head);                                                                                 \
  43         ((node)->name).next = head;                                                                                    \
  44         if (head) ((head)->name).atme = &(((node)->name).next);                                                        \
  45         head = node;                                                                                                   \
  46     } while (0)
  47 
  48 #define LL_REMOVE(node, name)                                                                                          \
  49     do {                                                                                                               \
  50         if (((node)->name).next) ((__typeof__(node))(node)->name.next)->name.atme = ((node)->name).atme;               \
  51         if (((node)->name).atme) *(((node)->name).atme) = ((node)->name).next;                                         \
  52         ((node)->name).atme = NULL;                                                                                    \
  53         ((node)->name).next = NULL;                                                                                    \
  54     } while (0)
  55 
  56 #define LEN(a) (sizeof(a) / sizeof(a[0]))
  57 #define FOREACH(type, var, array) for (type var = array; (var) < &(array)[LEN(array)]; var++)
  58 
  59 #define S1(x) #x
  60 #define S2(x) S1(x)
  61 #define __LOCATION__ __FILE__ ":" S2(__LINE__)
  62 
  63 // Error checking helper macros:
  64 #define nonnegative(exp, ...) check_nonnegative(exp, __LOCATION__ ": `" #exp "` " __VA_ARGS__)
  65 #define nonnull(exp, ...) check_nonnull(exp, __LOCATION__ ": `" #exp "` " __VA_ARGS__)
  66 // Error-checking memory allocation helper macros:
  67 #define new(t) check_nonnull(calloc(1, sizeof(t)), __LOCATION__ ": new(" #t ") failed")
  68 #define new_bytes(n) check_nonnull(calloc(1, n), __LOCATION__ ": new_bytes(" #n ") failed")
  69 #define grow(obj, new_count)                                                                                           \
  70     check_nonnull(reallocarray(obj, (new_count), sizeof(obj[0])),                                                      \
  71                   __LOCATION__ ": grow(" #obj ", " #new_count ") failed")
  72 #define check_strdup(s) check_nonnull(strdup(s), __LOCATION__ ": check_strdup(" #s ") failed")
  73 
  74 int check_nonnegative(int negative_err, const char *err_msg, ...);
  75 __attribute__((returns_nonnull)) void *check_nonnull(void *p, const char *err_msg, ...);
  76 __attribute__((nonnull)) void delete(void *p);
  77 
  78 #endif
  79 // vim: ts=4 sw=0 et cino=L2,l1,(0,W4,m1,\:0