Initial commit

Can display a single PNG image scaled-to-fit on all outputs.

1 files changed, 166 insertions, 0 deletions

diff --git a/log.c b/log.c
new file mode 100644
index 0000000..c5d9093
--- /dev/null
+++ b/log.c
@@ -0,0 +1,166 @@
+#include "log.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdarg.h>
+#include <string.h>
+#include <stdbool.h>
+#include <errno.h>
+#include <assert.h>
+#include <unistd.h>
+
+#include <syslog.h>
+
+static bool colorize = false;
+static bool do_syslog = true;
+
+void
+log_init(enum log_colorize _colorize, bool _do_syslog,
+         enum log_facility syslog_facility, enum log_class syslog_level)
+{
+    static const int facility_map[] = {
+        [LOG_FACILITY_USER] = LOG_USER,
+        [LOG_FACILITY_DAEMON] = LOG_DAEMON,
+    };
+
+    static const int level_map[] = {
+        [LOG_CLASS_ERROR] = LOG_ERR,
+        [LOG_CLASS_WARNING] = LOG_WARNING,
+        [LOG_CLASS_INFO] = LOG_INFO,
+        [LOG_CLASS_DEBUG] = LOG_DEBUG,
+    };
+
+    colorize = _colorize == LOG_COLORIZE_NEVER ? false : _colorize == LOG_COLORIZE_ALWAYS ? true : isatty(STDERR_FILENO);
+    do_syslog = _do_syslog;
+
+    if (do_syslog) {
+        openlog(NULL, /*LOG_PID*/0, facility_map[syslog_facility]);
+        setlogmask(LOG_UPTO(level_map[syslog_level]));
+    }
+}
+
+void
+log_deinit(void)
+{
+    if (do_syslog)
+        closelog();
+}
+
+static void
+_log(enum log_class log_class, const char *module, const char *file, int lineno,
+     const char *fmt, int sys_errno, va_list va)
+{
+    const char *class = "abcd";
+    int class_clr = 0;
+    switch (log_class) {
+    case LOG_CLASS_ERROR:    class = " err"; class_clr = 31; break;
+    case LOG_CLASS_WARNING:  class = "warn"; class_clr = 33; break;
+    case LOG_CLASS_INFO:     class = "info"; class_clr = 97; break;
+    case LOG_CLASS_DEBUG:    class = " dbg"; class_clr = 36; break;
+    }
+
+    char clr[16];
+    snprintf(clr, sizeof(clr), "\e[%dm", class_clr);
+    fprintf(stderr, "%s%s%s: ", colorize ? clr : "", class, colorize ? "\e[0m" : "");
+
+    if (colorize)
+        fprintf(stderr, "\e[2m");
+    fprintf(stderr, "%s:%d: ", file, lineno);
+    if (colorize)
+        fprintf(stderr, "\e[0m");
+
+    vfprintf(stderr, fmt, va);
+
+    if (sys_errno != 0)
+        fprintf(stderr, ": %s", strerror(sys_errno));
+
+    fprintf(stderr, "\n");
+}
+
+static void
+_sys_log(enum log_class log_class, const char *module,
+         const char *file __attribute__((unused)),
+         int lineno __attribute__((unused)),
+         const char *fmt, int sys_errno, va_list va)
+{
+    if (!do_syslog)
+        return;
+
+    /* Map our log level to syslog's level */
+    int level = -1;
+    switch (log_class) {
+    case LOG_CLASS_ERROR:    level = LOG_ERR; break;
+    case LOG_CLASS_WARNING:  level = LOG_WARNING; break;
+    case LOG_CLASS_INFO:     level = LOG_INFO; break;
+    case LOG_CLASS_DEBUG:    level = LOG_DEBUG; break;
+    }
+
+    assert(level != -1);
+
+    const char *sys_err = sys_errno != 0 ? strerror(sys_errno) : NULL;
+
+    va_list va2;
+    va_copy(va2, va);
+
+    /* Calculate required size of buffer holding the entire log message */
+    int required_len = 0;
+    required_len += strlen(module) + 2;  /* "%s: " */
+    required_len += vsnprintf(NULL, 0, fmt, va2); va_end(va2);
+
+    if (sys_errno != 0)
+        required_len += strlen(sys_err) + 2; /* ": %s" */
+
+    /* Format the msg */
+    char *msg = malloc(required_len + 1);
+    int idx = 0;
+
+    idx += snprintf(&msg[idx], required_len + 1 - idx, "%s: ", module);
+    idx += vsnprintf(&msg[idx], required_len + 1 - idx, fmt, va);
+
+    if (sys_errno != 0) {
+        snprintf(
+            &msg[idx], required_len + 1 - idx, ": %s", strerror(sys_errno));
+    }
+
+    syslog(level, "%s", msg);
+    free(msg);
+}
+
+void
+log_msg(enum log_class log_class, const char *module,
+        const char *file, int lineno, const char *fmt, ...)
+{
+    va_list ap1, ap2;
+    va_start(ap1, fmt);
+    va_copy(ap2, ap1);
+    _log(log_class, module, file, lineno, fmt, 0, ap1);
+    _sys_log(log_class, module, file, lineno, fmt, 0, ap2);
+    va_end(ap1);
+    va_end(ap2);
+}
+
+void log_errno(enum log_class log_class, const char *module,
+               const char *file, int lineno,
+               const char *fmt, ...)
+{
+    va_list ap1, ap2;
+    va_start(ap1, fmt);
+    va_copy(ap2, ap1);
+    _log(log_class, module, file, lineno, fmt, errno, ap1);
+    _sys_log(log_class, module, file, lineno, fmt, errno, ap2);
+    va_end(ap1);
+    va_end(ap2);
+}
+
+void log_errno_provided(enum log_class log_class, const char *module,
+                        const char *file, int lineno, int _errno,
+                        const char *fmt, ...)
+{
+    va_list ap1, ap2;
+    va_start(ap1, fmt);
+    va_copy(ap2, ap1);
+    _log(log_class, module, file, lineno, fmt, _errno, ap1);
+    _sys_log(log_class, module, file, lineno, fmt, _errno, ap2);
+    va_end(ap1);
+    va_end(ap2);
+}