Mercurial > dovecot > core-2.2

annotate src/lib/hook-build.c @ 22664:fea53c2725c0

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director: Fix director_max_parallel_moves/kicks type Should be uint, not time.
author Timo Sirainen <timo.sirainen@dovecot.fi>
date Thu, 09 Nov 2017 12:24:16 +0200
parents 538853d82926
children cb108f786fb4
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1 /* Copyright (c) 2009-2017 Dovecot authors, see the included COPYING file */
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2
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3 #include "lib.h"
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4 #include "array.h"
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5 #include "llist.h"
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6 #include "hook-build.h"
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7
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8 struct hook_stack {
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9 struct hook_stack *prev, *next;
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10
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11 /* Pointer to vfuncs struct. This assumes that a struct containing
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12 function pointers equals to an array of function pointers. Not
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13 ANSI-C, but should work in all OSes supported by Dovecot. Much
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14 easier anyway than doing this work manually.. */
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15 void (**vfuncs)();
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16 /* nonzero in the areas where vfuncs has been changed */
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17 void (**mask)();
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18 };
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19
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20 struct hook_build_context {
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21 pool_t pool;
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22 /* size of the vfuncs struct */
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23 size_t size;
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24 /* number of function pointers in the struct */
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25 unsigned int count;
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26
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27 struct hook_stack *head, *tail;
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28 };
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29
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30 static void hook_build_append(struct hook_build_context *ctx, void (**vfuncs)())
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31 {
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32 struct hook_stack *stack;
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33
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34 stack = p_new(ctx->pool, struct hook_stack, 1);
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35 stack->vfuncs = vfuncs;
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36 stack->mask = p_malloc(ctx->pool, ctx->size);
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37 DLLIST2_APPEND(&ctx->head, &ctx->tail, stack);
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38 }
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39
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40 struct hook_build_context *hook_build_init(void (**vfuncs)(), size_t size)
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41 {
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42 struct hook_build_context *ctx;
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43 pool_t pool;
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44
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45 i_assert((size % sizeof(void (*)())) == 0);
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46
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47 pool = pool_alloconly_create("hook build context", 2048);
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48 ctx = p_new(pool, struct hook_build_context, 1);
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49 ctx->pool = pool;
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50 ctx->size = size;
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51 ctx->count = size / sizeof(void (*)());
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52 hook_build_append(ctx, vfuncs);
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53 return ctx;
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54 }
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55
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56 static void
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57 hook_update_mask(struct hook_build_context *ctx, struct hook_stack *stack,
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58 void (**vlast)())
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59 {
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60 unsigned int i;
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61
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62 for (i = 0; i < ctx->count; i++) {
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63 if (stack->vfuncs[i] != vlast[i]) {
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64 i_assert(stack->vfuncs[i] != NULL);
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65 stack->mask[i] = stack->vfuncs[i];
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66 }
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67 }
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68 }
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69
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70 static void
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71 hook_copy_stack(struct hook_build_context *ctx, struct hook_stack *stack)
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72 {
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73 unsigned int i;
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74
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75 i_assert(stack->next != NULL);
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76
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77 for (i = 0; i < ctx->count; i++) {
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78 if (stack->mask[i] == NULL) {
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79 stack->vfuncs[i] = stack->next->vfuncs[i];
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80 stack->mask[i] = stack->next->mask[i];
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81 }
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82 }
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83 }
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84
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85 void hook_build_update(struct hook_build_context *ctx, void *_vlast)
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86 {
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87 void (**vlast)() = _vlast;
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88 struct hook_stack *stack;
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89
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90 if (ctx->tail->vfuncs == vlast) {
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91 /* no vfuncs overridden */
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92 return;
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93 }
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94
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95 /* ctx->vfuncs_stack->vfuncs points to the root vfuncs,
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96 ctx->vfuncs_stack->next->vfuncs points to the first super function
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97 that is being called, and so on.
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98
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99 the previous plugin added its vfuncs to the stack tail.
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100 vlast contains the previous plugin's super vfuncs, which is where
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101 the next plugin should put its own vfuncs.
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102
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103 first we'll need to figure out what vfuncs the previous plugin
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104 changed and update the mask */
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105 hook_update_mask(ctx, ctx->tail, vlast);
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106
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107 /* now go up in the stack as long as the mask isn't set,
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108 and update the vfuncs */
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109 for (stack = ctx->tail->prev; stack != NULL; stack = stack->prev)
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110 hook_copy_stack(ctx, stack);
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111
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112 /* add vlast to stack */
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113 hook_build_append(ctx, vlast);
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114 }
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115
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116 void hook_build_deinit(struct hook_build_context **_ctx)
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117 {
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118 struct hook_build_context *ctx = *_ctx;
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119 *_ctx = NULL;
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120 pool_unref(&ctx->pool);
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121 }