Fix last commit

util.c

@@ -0,0 +1,59 @@
+#include "util.h"
+
+#include <errno.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+
+void* realloc_safe(void* oldptr, size_t size)
+{
+    static const char OOM_MSG[] = "fatal: out of memory\n";
+    void* ptr = realloc(oldptr, size);
+    if (size && !ptr) {
+        fwrite(OOM_MSG, 1, sizeof(OOM_MSG) - 1, stderr);
+        abort();
+    }
+    return ptr;
+}
+
+void* malloc_safe(size_t size)
+{
+    return realloc_safe(NULL, size);
+}
+
+// asprintf is not POSIX
+int alloc_sprintf(char* restrict* restrict out, const char* restrict fmt, ...)
+{
+    va_list args;
+    va_start(args, fmt);
+    va_list args2;
+    va_copy(args2, args);
+    int need = vsnprintf(NULL, 0, fmt, args2);
+    va_end(args2);
+    *out = realloc_safe(*out, need + 1);
+    int written = vsnprintf(*out, need + 1, fmt, args);
+    va_end(args);
+    return written;
+}
+
+void log_error(const char* restrict fmt, ...)
+{
+    time_t cur_time = time(NULL);
+    struct tm tm;
+    localtime_r(&cur_time, &tm);
+    char time_str[32];
+    strftime(time_str, sizeof(time_str), "%c", &tm);
+    fprintf(stderr, "[%s] error: ", time_str);
+    va_list args;
+    va_start(args, fmt);
+    vfprintf(stderr, fmt, args);
+    va_end(args);
+    fputc('\n', stderr);
+}
+
+void log_errno(const char* detail)
+{
+    log_error("%s: %s", detail, strerror(errno));
+}