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Merge pull request #4 from m1ngsama/optimize/message-loading

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[Optimize] Message history loading efficiency
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m1ngsama 2025-12-02 12:39:34 +08:00 committed by GitHub
commit bf1fb99d11
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1 changed files with 29 additions and 23 deletions
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52
src/message.c
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@ -25,19 +25,35 @@ int message_load(message_t **messages, int max_messages) {
char line[2048];
int count = 0;
int total = 0;
/* Read all messages first to get total count */
message_t *temp_array = calloc(max_messages * 10, sizeof(message_t));
if (!temp_array) {
*messages = msg_array; /* Set the allocated array even on error */
fclose(fp);
return 0;
/* Use a ring buffer approach - keep only last max_messages */
/* First, count total lines and seek to appropriate position */
long file_pos[1000]; /* Track positions of last 1000 lines */
int line_count = 0;
int start_index = 0;
/* Record file positions */
while (fgets(line, sizeof(line), fp) && line_count < 1000) {
file_pos[line_count++] = ftell(fp) - strlen(line);
}
while (fgets(line, sizeof(line), fp) && total < max_messages * 10) {
/* Determine where to start reading */
if (line_count > max_messages) {
start_index = line_count - max_messages;
fseek(fp, file_pos[start_index], SEEK_SET);
} else {
fseek(fp, 0, SEEK_SET);
start_index = 0;
}
/* Now read the messages */
while (fgets(line, sizeof(line), fp) && count < max_messages) {
/* Format: RFC3339_timestamp|username|content */
char *timestamp_str = strtok(line, "|");
char line_copy[2048];
strncpy(line_copy, line, sizeof(line_copy) - 1);
line_copy[sizeof(line_copy) - 1] = '\0';
char *timestamp_str = strtok(line_copy, "|");
char *username = strtok(NULL, "|");
char *content = strtok(NULL, "\n");
@ -52,23 +68,13 @@ int message_load(message_t **messages, int max_messages) {
continue;
}
temp_array[total].timestamp = mktime(&tm);
strncpy(temp_array[total].username, username, MAX_USERNAME_LEN - 1);
strncpy(temp_array[total].content, content, MAX_MESSAGE_LEN - 1);
total++;
msg_array[count].timestamp = mktime(&tm);
strncpy(msg_array[count].username, username, MAX_USERNAME_LEN - 1);
strncpy(msg_array[count].content, content, MAX_MESSAGE_LEN - 1);
count++;
}
fclose(fp);
/* Keep only the last max_messages */
int start = (total > max_messages) ? (total - max_messages) : 0;
count = total - start;
for (int i = 0; i < count; i++) {
msg_array[i] = temp_array[start + i];
}
free(temp_array);
*messages = msg_array;
return count;
}