Better logging, fixes #15

src/log.c

@@ -0,0 +1,99 @@
+#include "log.h"
+
+const char *log_colors[] = {
+        "\033[34m", "\033[01;34m", "\033[0m",
+        "\033[01;33m", "\033[31m", "\033[01;31m"
+};
+
+const char *log_levels[] = {
+        "DEBUG", "INFO", "WARNING", "ERROR", "FATAL"
+};
+
+void sist_logf(char *filepath, int level, char *format, ...) {
+
+    static int is_tty = -1;
+    if (is_tty == -1) {
+        is_tty = isatty(STDERR_FILENO);
+    }
+
+    char log_str[LOG_MAX_LENGTH];
+
+    unsigned long long pid = (unsigned long long) pthread_self();
+
+    char datetime[32];
+    time_t t;
+    struct tm result;
+    t = time(NULL);
+    localtime_r(&t, &result);
+    strftime(datetime, sizeof(datetime), "%Y-%m-%d %H:%M:%S", &result);
+
+    int log_len;
+    if (is_tty) {
+        log_len = snprintf(
+                log_str, sizeof(log_str),
+                "\033[%dm[%04X]%s [%s] [%s %s] ",
+                31 + ((unsigned int) (pid)) % 7, pid, log_colors[level],
+                datetime, log_levels[level], filepath
+        );
+    } else {
+        log_len = snprintf(
+                log_str, sizeof(log_str),
+                "[%04X] [%s] [%s %s] ",
+                pid, datetime, log_levels[level], filepath
+        );
+    }
+
+    va_list ap;
+    va_start(ap, format);
+    size_t maxsize = sizeof(log_str) - log_len;
+    log_len += vsnprintf(log_str + log_len, maxsize, format, ap);
+    va_end(ap);
+
+    if (is_tty) {
+        log_len += sprintf(log_str + log_len, "\033[0m\n");
+    } else {
+        *(log_str + log_len) = '\n';
+        log_len += 1;
+    }
+
+    write(STDOUT_FILENO, log_str, log_len);
+}
+
+void sist_log(char *filepath, int level, char *str) {
+
+    static int is_tty = -1;
+    if (is_tty == -1) {
+        is_tty = isatty(STDERR_FILENO);
+    }
+
+    char log_str[LOG_MAX_LENGTH];
+
+    unsigned long long pid = (unsigned long long) pthread_self();
+
+    char datetime[32];
+    time_t t;
+    struct tm result;
+    t = time(NULL);
+    localtime_r(&t, &result);
+    strftime(datetime, sizeof(datetime), "%Y-%m-%d %H:%M:%S", &result);
+
+    int log_len;
+    if (is_tty) {
+        log_len = snprintf(
+                log_str, sizeof(log_str),
+                "\033[%dm[%04X]%s [%s] [%s %s] %s \033[0m\n",
+                31 + ((unsigned int) (pid)) % 7, pid, log_colors[level],
+                datetime, log_levels[level], filepath,
+                str
+        );
+    } else {
+        log_len = snprintf(
+                log_str, sizeof(log_str),
+                "[%04X] [%s] [%s %s] %s \n",
+                pid, datetime, log_levels[level], filepath,
+                str
+        );
+    }
+
+    write(STDERR_FILENO, log_str, log_len);
+}