Move everything around - delete old Haskell code, clean up build.

locfile.h

@@ -0,0 +1,78 @@
+#ifndef _LOCFILE_H
+#define _LOCFILE_H
+#include <stdlib.h>
+#include <stdio.h>
+#include <assert.h>
+#include <stdarg.h>
+typedef struct {
+  int start, end;
+} location;
+
+static const location UNKNOWN_LOCATION = {-1, -1};
+
+struct locfile {
+  const char* data;
+  int length;
+  int* linemap;
+  int nlines;
+};
+
+static void locfile_init(struct locfile* l, const char* data, int length) {
+  l->data = data;
+  l->length = length;
+  l->nlines = 1;
+  for (int i=0; i<length; i++) {
+    if (data[i] == '\n') l->nlines++;
+  }
+  l->linemap = malloc(sizeof(int) * (l->nlines + 1));
+  l->linemap[0] = 0;
+  int line = 1;
+  for (int i=0; i<length; i++) {
+    if (data[i] == '\n') {
+      l->linemap[line] = i;
+      line++;
+    }
+  }
+  l->linemap[l->nlines] = length;
+}
+
+static void locfile_free(struct locfile* l) {
+  free(l->linemap);
+}
+
+static int locfile_get_line(struct locfile* l, int pos) {
+  assert(pos < l->length);
+  int line = 0;
+  while (l->linemap[line+1] < pos) line++;
+  assert(line < l->nlines);
+  return line;
+}
+
+static int locfile_line_length(struct locfile* l, int line) {
+  assert(line < l->nlines);
+  return l->linemap[line+1] - l->linemap[line];
+}
+
+static void locfile_locate(struct locfile* l, location loc, const char* fmt, ...) {
+  va_list fmtargs;
+  va_start(fmtargs, fmt);
+  vfprintf(stderr, fmt, fmtargs);
+  va_end(fmtargs);
+  fprintf(stderr, "\n");
+  if (loc.start == -1) {
+    fprintf(stderr, "<unknown location>\n");
+    return;
+  }
+  int startline = locfile_get_line(l, loc.start);
+  int offset = l->linemap[startline];
+  fprintf(stderr, "%.*s\n", locfile_line_length(l, startline), l->data + offset);
+  fprintf(stderr, "%*s", loc.start - offset, "");
+  for (int i = loc.start; 
+       i < loc.end && i < offset + locfile_line_length(l, startline);
+       i++){
+    fprintf(stderr, "^");
+  }
+  fprintf(stderr, "\n");
+}
+
+#endif