1 files changed, 41 insertions, 0 deletions
diff --git a/src/util.h b/src/util.h
new file mode 100644
index 0000000..d62186c
--- /dev/null
+++ b/src/util.h
@@ -0,0 +1,41 @@
+#pragma once
+
+#include <err.h>
+
+struct region {
+   size_t start, end, offset;
+};
+
+static inline bool
+region_parse(struct region *region, const char *line)
+{
+   *region = (struct region){0};
+   if (sscanf(line, "%zx-%zx %*s %zx", &region->start, &region->end, &region->offset) < 3 || region->start > region->end) {
+      warnx("failed to parse mapping:\n%s", line);
+      return false;
+   }
+   return true;
+}
+
+static inline void
+for_each_line_in_file(FILE *f, void (*cb)(const char *line, void *data), void *data)
+{
+   char *buffer = NULL;
+   size_t step = 1024, allocated = 0, written = 0, read = 0;
+   do {
+      if (written + read >= allocated && !(buffer = realloc(buffer, (allocated += step) + 1)))
+         err(EXIT_FAILURE, "realloc");
+
+      buffer[(written += read)] = 0;
+
+      size_t ate = 0;
+      for (char *line = buffer, *nl; (nl = strchr(line, '\n')); line = nl + 1) {
+         *nl = 0;
+         cb(line, data);
+         ate += nl + 1 - line;
+      }
+
+      memmove(buffer, buffer + ate, (written = written - ate));
+   } while ((read = fread(buffer + written, 1, allocated - written, f)));
+   free(buffer);
+}