Initial commit

src/util.c

@@ -0,0 +1,58 @@
+
+#include "util.h"
+
+#include <err.h>
+#include <errno.h>
+#include <execinfo.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+void* malloc_or_die(size_t size)
+{
+    void* result = malloc(size);
+
+    if (result == NULL)
+        err(errno, "malloc_or_die failed");
+
+    return result;
+}
+
+void* realloc_or_die(void* ptr, size_t size)
+{
+    ptr = realloc(ptr, size);
+
+    if (ptr == NULL)
+        err(errno, "realloc_or_die failed");
+
+    return ptr;
+}
+
+void* calloc_or_die(size_t nmemb, size_t size)
+{
+    void* ptr = calloc(nmemb, size);
+
+    if (ptr == NULL)
+        err(errno, "calloc_or_die failed");
+
+    return ptr;
+}
+
+// from the glibc man pages
+// https://www.gnu.org/software/libc/manual/html_node/Backtraces.html
+void print_trace()
+{
+    void* array[500];
+    char** strings;
+    int size, i;
+
+    size = backtrace(array, 500);
+    strings = backtrace_symbols(array, size);
+
+    if (strings != NULL) {
+        printf("Obtained %d stack frames.\n", size);
+        for (i = 0; i < size; i++)
+            printf("%s\n", strings[i]);
+    }
+
+    free(strings);
+}