Even more informative error messages from make_shim

1 files changed, 14 insertions, 6 deletions

diff --git a/tools/make_shim.c b/tools/make_shim.c
index c5b684e..70da31d 100644
--- a/tools/make_shim.c
+++ b/tools/make_shim.c
@@ -54,17 +54,19 @@ size_t strrcspn(const char *s1, const char *s2) {
     return _s1 - s1;
 }
 
-#define RIP(errmsg) {            \
-    if (errno == 0) errno = EIO; \
-    perror(errmsg);              \
-    if (file) fclose(file);      \
-    return 1;                    \
+#define RIP(errmsg) {                                                \
+    fprintf(stderr, "%s:%d:%s: %s\n", fname, lineno, eline, errmsg); \
+    if (file) fclose(file);                                          \
+    return 1;                                                        \
 }
 
 int main(int argc, char * argv[]) {
     int ch;
     char line[16*1024];
+    char eline[16*1024];
     char *lineptr = NULL;
+    char *fname;
+    int lineno;
 
     section_t section_list[] = {
         {0x4000, false, "ROM0", false},
@@ -93,15 +95,21 @@ int main(int argc, char * argv[]) {
     }
 
     for (int arg_idx = optind; arg_idx < argc; arg_idx++) {
-        FILE * file = fopen(argv[arg_idx], "r");
+        eline[0] = 0;
+        lineno = 0;
+        fname = argv[arg_idx];
+        FILE * file = fopen(fname, "r");
         if (file == NULL)
             RIP("Unable to open file");
         while ((lineptr = fgets(line, sizeof(line), file)) != NULL) {
+            lineno++;
             unsigned short bank = 0;
             unsigned short pointer = 0;
             char * symbol = NULL;
             char * end;
             char * addr_p;
+            strcpy(eline, line);  // Unmodified copy for tracebacks
+            *strrchr(eline, '\n') = 0;
 
             // line = line.split(";")[0].strip()
             lineptr += strspn(lineptr, " \t\n");