Start fleshing out wayland client implementation

This introduces a basic shared framework for making wayland clients
within sway itself.

1 files changed, 159 insertions, 0 deletions

diff --git a/common/log.c b/common/log.c
new file mode 100644
index 00000000..02aac4c1
--- /dev/null
+++ b/common/log.c
@@ -0,0 +1,159 @@
+#include "log.h"
+#include "sway.h"
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <libgen.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <signal.h>
+#include <errno.h>
+#include <string.h>
+#include <stringop.h>
+#include <execinfo.h>
+
+int colored = 1;
+log_importance_t loglevel_default = L_ERROR;
+log_importance_t v = L_SILENT;
+
+static const char *verbosity_colors[] = {
+        [L_SILENT] = "",
+        [L_ERROR ] = "\x1B[1;31m",
+        [L_INFO  ] = "\x1B[1;34m",
+        [L_DEBUG ] = "\x1B[1;30m",
+};
+
+void init_log(log_importance_t verbosity) {
+        if (verbosity != L_DEBUG) {
+                // command "debuglog" needs to know the user specified log level when
+                // turning off debug logging.
+                loglevel_default = verbosity;
+        }
+        v = verbosity;
+        signal(SIGSEGV, error_handler);
+        signal(SIGABRT, error_handler);
+}
+
+void set_log_level(log_importance_t verbosity) {
+        v = verbosity;
+}
+
+void reset_log_level(void) {
+        v = loglevel_default;
+}
+
+bool toggle_debug_logging(void) {
+        v = (v == L_DEBUG) ? loglevel_default : L_DEBUG;
+        return (v == L_DEBUG);
+}
+
+void sway_log_colors(int mode) {
+        colored = (mode == 1) ? 1 : 0;
+}
+
+void sway_abort(const char *format, ...) {
+        fprintf(stderr, "ERROR: ");
+        va_list args;
+        va_start(args, format);
+        vfprintf(stderr, format, args);
+        va_end(args);
+        fprintf(stderr, "\n");
+        sway_terminate();
+}
+
+#ifndef NDEBUG
+void _sway_log(const char *filename, int line, log_importance_t verbosity, const char* format, ...) {
+#else
+void _sway_log(log_importance_t verbosity, const char* format, ...) {
+#endif
+        if (verbosity <= v) {
+                unsigned int c = verbosity;
+                if (c > sizeof(verbosity_colors) / sizeof(char *)) {
+                        c = sizeof(verbosity_colors) / sizeof(char *) - 1;
+                }
+
+                if (colored && isatty(STDERR_FILENO)) {
+                        fprintf(stderr, "%s", verbosity_colors[c]);
+                }
+
+                va_list args;
+                va_start(args, format);
+#ifndef NDEBUG
+                char *file = strdup(filename);
+                fprintf(stderr, "[%s:%d] ", basename(file), line);
+                free(file);
+#endif
+                vfprintf(stderr, format, args);
+                va_end(args);
+
+                if (colored && isatty(STDERR_FILENO)) {
+                        fprintf(stderr, "\x1B[0m");
+                }
+                fprintf(stderr, "\n");
+        }
+}
+
+void sway_log_errno(log_importance_t verbosity, char* format, ...) {
+        if (verbosity <= v) {
+                unsigned int c = verbosity;
+                if (c > sizeof(verbosity_colors) / sizeof(char *)) {
+                        c = sizeof(verbosity_colors) / sizeof(char *) - 1;
+                }
+
+                if (colored && isatty(STDERR_FILENO)) {
+                        fprintf(stderr, "%s", verbosity_colors[c]);
+                }
+
+                va_list args;
+                va_start(args, format);
+                vfprintf(stderr, format, args);
+                va_end(args);
+
+                fprintf(stderr, ": ");
+                fprintf(stderr, "%s", strerror(errno));
+
+                if (colored && isatty(STDERR_FILENO)) {
+                        fprintf(stderr, "\x1B[0m");
+                }
+                fprintf(stderr, "\n");
+        }
+}
+
+bool _sway_assert(bool condition, const char* format, ...) {
+        if (condition) {
+                return true;
+        }
+
+        va_list args;
+        va_start(args, format);
+        sway_log(L_ERROR, format, args);
+        va_end(args);
+
+#ifndef NDEBUG
+        raise(SIGABRT);
+#endif
+
+        return false;
+}
+
+void error_handler(int sig) {
+        int i;
+        int max_lines = 20;
+        void *array[max_lines];
+        char **bt;
+        size_t bt_len;
+
+        sway_log(L_ERROR, "Error: Signal %d. Printing backtrace", sig);
+        bt_len = backtrace(array, max_lines);
+        bt = backtrace_symbols(array, bt_len);
+        if (!bt) {
+                sway_log(L_ERROR, "Could not allocate sufficient memory for backtrace_symbols(), falling back to stderr");
+                backtrace_symbols_fd(array, bt_len, STDERR_FILENO);
+                exit(1);
+        }
+
+        for (i = 0; (size_t)i < bt_len; i++) {
+                sway_log(L_ERROR, "Backtrace: %s", bt[i]);
+        }
+        exit(1);
+}