Andrew's git - gitweb.git/blob - vcs-svn/string

   1/*
   2 * Licensed under a two-clause BSD-style license.
   3 * See LICENSE for details.
   4 */
   5
   6#include "git-compat-util.h"
   7#include "quote.h"
   8#include "trp.h"
   9#include "obj_pool.h"
  10#include "string_pool.h"
  11
  12static struct trp_root tree = { ~0 };
  13
  14struct node {
  15        uint32_t offset;
  16        struct trp_node children;
  17};
  18
  19/* Two memory pools: one for struct node, and another for strings */
  20obj_pool_gen(node, struct node, 4096)
  21obj_pool_gen(string, char, 4096)
  22
  23static char *node_value(struct node *node)
  24{
  25        return node ? string_pointer(node->offset) : NULL;
  26}
  27
  28static int node_cmp(struct node *a, struct node *b)
  29{
  30        return strcmp(node_value(a), node_value(b));
  31}
  32
  33/* Build a Treap from the node structure (a trp_node w/ offset) */
  34trp_gen(static, tree_, struct node, children, node, node_cmp);
  35
  36const char *pool_fetch(uint32_t entry)
  37{
  38        return node_value(node_pointer(entry));
  39}
  40
  41uint32_t pool_intern(const char *key)
  42{
  43        /* Canonicalize key */
  44        struct node *match = NULL, *node;
  45        uint32_t key_len;
  46        if (key == NULL)
  47                return ~0;
  48        key_len = strlen(key) + 1;
  49        node = node_pointer(node_alloc(1));
  50        node->offset = string_alloc(key_len);
  51        strcpy(node_value(node), key);
  52        match = tree_search(&tree, node);
  53        if (!match) {
  54                tree_insert(&tree, node);
  55        } else {
  56                node_free(1);
  57                string_free(key_len);
  58                node = match;
  59        }
  60        return node_offset(node);
  61}
  62
  63uint32_t pool_tok_r(char *str, const char *delim, char **saveptr)
  64{
  65        char *token = strtok_r(str, delim, saveptr);
  66        return token ? pool_intern(token) : ~0;
  67}
  68
  69void pool_print_seq(uint32_t len, const uint32_t *seq, char delim, FILE *stream)
  70{
  71        uint32_t i;
  72        for (i = 0; i < len && ~seq[i]; i++) {
  73                fputs(pool_fetch(seq[i]), stream);
  74                if (i < len - 1 && ~seq[i + 1])
  75                        fputc(delim, stream);
  76        }
  77}
  78
  79void pool_print_seq_q(uint32_t len, const uint32_t *seq, char delim, FILE *stream)
  80{
  81        uint32_t i;
  82        for (i = 0; i < len && ~seq[i]; i++) {
  83                quote_c_style(pool_fetch(seq[i]), NULL, stream, 1);
  84                if (i < len - 1 && ~seq[i + 1])
  85                        fputc(delim, stream);
  86        }
  87}
  88
  89uint32_t pool_tok_seq(uint32_t sz, uint32_t *seq, const char *delim, char *str)
  90{
  91        char *context = NULL;
  92        uint32_t token = ~0;
  93        uint32_t length;
  94
  95        if (sz == 0)
  96                return ~0;
  97        if (str)
  98                token = pool_tok_r(str, delim, &context);
  99        for (length = 0; length < sz; length++) {
 100                seq[length] = token;
 101                if (token == ~0)
 102                        return length;
 103                token = pool_tok_r(NULL, delim, &context);
 104        }
 105        seq[sz - 1] = ~0;
 106        return sz;
 107}
 108
 109void pool_reset(void)
 110{
 111        node_reset();
 112        string_reset();
 113}