1 /* Blerg is (C) 2011 The Dominion of Awesome, and is distributed under a
2 * BSD-style license. Please see the COPYING file for details.
17 #define TAG_CHAR(c) ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c >= '0' && c <= '9') || c == '-' || c == '_')
18 #define WHITESPACE(c) (c == ' ' || c == '\t' || c == '\n' || c == '\r')
20 int tag_scan(const char *author, const char *data, int len, uint64_t record) {
21 char *taglist[MAX_TAGS_PER_RECORD];
26 for (i = 0; i < len; i++) {
28 if (WHITESPACE(last_char) && (data[i] == '#' || data[i] == '@')) {
29 if (n_tags == MAX_TAGS_PER_RECORD) {
30 fprintf(stderr, "Too many tags in message\n");
35 while (i < len && TAG_CHAR(data[i]) && (i - start < MAX_TAG_LENGTH)) {
38 if (start - i == 0) continue;
39 char *tag = calloc(1, MAX_TAG_LENGTH + 2);
40 memcpy(tag, &data[begin], i - begin);
41 for (j = 0; j < n_tags; j++) {
42 if (!strncmp(tag, taglist[j], MAX_TAG_LENGTH)) {
43 // We already have this tag. Start over.
45 last_char = data[i-1];
49 taglist[n_tags] = tag;
51 last_char = data[i-1];
52 // We goto here so i doesn't get incremented
58 for (i = 0; i < n_tags; i++) {
59 tag_add(author, taglist[i], record);
64 int tag_add(const char *author, const char *tag, uint64_t record) {
68 memset(t.author, 0, 32);
69 strncpy(t.author, author, 32);
74 snprintf(filename, 512, "%s/%s", HASH_TAGS_PATH, tag + 1);
77 snprintf(filename, 512, "%s/%s", REF_TAGS_PATH, tag + 1);
80 fprintf(stderr, "Invalid tag type: %s\n", tag);
84 int tag_fd = open(filename, O_WRONLY | O_APPEND | O_CREAT, 0600);
85 flock(tag_fd, LOCK_EX);
87 perror("Could not open tag file");
90 int n = write(tag_fd, &t, sizeof(struct tag));
91 if (n < sizeof(struct tag)) {
92 perror("Could not write new tag");
95 flock(tag_fd, LOCK_UN);
101 struct tag * tag_list(const char *tag, uint64_t offset, int *count, int direction) {
106 uint64_t n_tag_records;
108 if (!valid_name(tag + 1))
113 snprintf(filename, 512, "%s/%s", HASH_TAGS_PATH, tag + 1);
116 snprintf(filename, 512, "%s/%s", REF_TAGS_PATH, tag + 1);
119 fprintf(stderr, "Invalid tag type: %s\n", tag);
123 int tag_fd = open(filename, O_RDONLY, 0600);
125 perror("Could not open tag file");
131 if (st.st_size == 0) {
136 n_tag_records = st.st_size / sizeof(struct tag);
137 if (*count > n_tag_records)
138 *count = n_tag_records;
139 if (offset > n_tag_records) {
140 fprintf(stderr, "Cannot access tag record beyond end\n");
144 taglist = (struct tag *) mmap(NULL, st.st_size, PROT_READ, MAP_SHARED, tag_fd, 0);
145 if (taglist == MAP_FAILED) {
146 perror("Could not mmap tag file");
147 goto tag_list_map_failed;
149 retlist = (struct tag *) malloc(sizeof(struct tag) * *count);
150 if (retlist == NULL) {
151 perror("Could not allocate memory for tag list");
152 goto tag_list_malloc_failed;
156 memcpy(retlist, taglist + offset, sizeof(struct tag) * *count);
159 memcpy(retlist, taglist + (n_tag_records - *count - offset), sizeof(struct tag) * *count);
163 munmap(taglist, st.st_size);
167 tag_list_malloc_failed:
168 munmap(taglist, st.st_size);
171 tag_list_open_failed:
175 int tag_exists(const char *tag) {
178 if (!valid_name(tag + 1))
181 if (!(tag[0] == '@' || tag[0] == '#')) {
182 fprintf(stderr, "Invalid tag: %s\n", tag);
188 snprintf(filename, 512, "%s/%s", HASH_TAGS_PATH, tag + 1);
191 snprintf(filename, 512, "%s/%s", REF_TAGS_PATH, tag + 1);
194 fprintf(stderr, "Invalid tag type: %s\n", tag);
197 if (access(filename, F_OK) == -1)