Pull segfault-handling into a dedicated function and ifdef.

Some stringing tweaks.

src/object.c

@@ -129,7 +129,8 @@ Object* nf_addToList(Object* dest, const Object src)
 }
 
 #ifndef SIMPLE_ERRORS
-static const char* errorText[] = {"MISMATCHED_PARENS",
+static const char* errorText[] = {
+    "MISMATCHED_PARENS",
     "NULL_ENV",
     "EMPTY_ENV",
     "NULL_PARSE",
@@ -246,20 +247,20 @@ int stringNObj(struct string* s, const Object* obj)
         case TYPE_BOOL:
             s->cursor += sprintf(s->cursor, "%s", obj->number ? "T" : "F");
             break;
+        case TYPE_SYMBOL:
         case TYPE_STRING: {
             size_t stringLen = strlen(obj->string);
             inflate(s, stringLen);
-            s->cursor += sprintf(s->cursor, "%s", obj->string);
+            const char* format = obj->type == TYPE_STRING ? "%s" : "`%s`";
+            s->cursor += sprintf(s->cursor, format, obj->string);
             break;
         }
-        case TYPE_SYMBOL:
-            s->cursor += sprintf(s->cursor, "`%s`", obj->string);
-            break;
         case TYPE_STRUCT:
             stringStruct(s, obj);
             break;
-        case TYPE_LIST:
         case TYPE_SLIST:
+            s->cursor += sprintf(s->cursor, "'");
+        case TYPE_LIST:
             stringList(s, obj);
             break;
         case TYPE_ERROR: {

src/object.h

@@ -13,6 +13,7 @@
 #define printd(...) printf(__VA_ARGS__)
 #else
 #define printd(...) do { } while (0)
+#define eprintf(...) fprintf(stderr, __VA_ARGS__)
 #endif
 #endif
 

src/pebblisp.c

@@ -15,9 +15,6 @@
 #include <readline/readline.h>
 #include <readline/history.h>
 
-#include <signal.h>
-#include <ucontext.h>
-
 #include "web.h"
 
 #endif
@@ -677,6 +674,10 @@ void loadArgsIntoEnv(int argc, const char* argv[], struct Environment* env)
     addToEnv(env, "args", args);
 }
 
+#ifdef __x86_64__
+#include <signal.h>
+#include <ucontext.h>
+
 int nestedSegfault = 0;
 
 void handler(int nSignum, siginfo_t* si, void* vcontext)
@@ -697,10 +698,29 @@ void handler(int nSignum, siginfo_t* si, void* vcontext)
     context->uc_mcontext.gregs[REG_RIP]++;
     exit(139);
 }
+void setupSegfaultHandler()
+{
+    struct sigaction action;
+    memset(&action, 0, sizeof(struct sigaction));
+    action.sa_flags = SA_SIGINFO;
+    action.sa_sigaction = handler;
+    sigaction(SIGSEGV, &action, NULL);
 
-// TODO: Track crashes in ~/.plcrash or some such
+}
+#else
+void setupSegfaultHandler()
+{
+}
+#endif
+
+// TODO: add --no-lib and --no-config and/or --config=
 int main(int argc, const char* argv[])
 {
+    setupSegfaultHandler();
+
+    const char* const home = getenv("HOME");
+    char config[strlen(home) + 15];
+
     struct Environment env = defaultEnv();
     setGlobal(&env);
 
@@ -714,12 +734,6 @@ int main(int argc, const char* argv[])
         }
     }
 
-    struct sigaction action;
-    memset(&action, 0, sizeof(struct sigaction));
-    action.sa_flags = SA_SIGINFO;
-    action.sa_sigaction = handler;
-    sigaction(SIGSEGV, &action, NULL);
-
     readFile(SCRIPTDIR "/lib.pbl", &env);
 
     Object o = parseEval("(def prompt \"pebblisp::> \")", &env);
@@ -727,8 +741,6 @@ int main(int argc, const char* argv[])
     o = parseEval("(def preprocess (fn (text) (text)))", &env);
     cleanObject(&o);
 
-    const char* const home = getenv("HOME");
-    char config[strlen(home) + 15];
     sprintf(config, "%s/.pebblisp.pbl", home);
     readFile(config, &env);
 
@@ -753,9 +765,9 @@ int main(int argc, const char* argv[])
     }
     deleteEnv(&env);
     shredDictionary();
-    // fprintf(stderr, "totalSearchDepth: %d of %d searches\n", getTotalSearchDepth(), getTotalSearches());
+    // eprintf("totalSearchDepth: %d of %d searches\n", getTotalSearchDepth(), getTotalSearches());
-    // fprintf(stderr, "\nHEAP-ALLOCATED OBJECTS: %d\n", getAllocations());
+    // eprintf("\nHEAP-ALLOCATED OBJECTS: %d\n", getAllocations());
-    // fprintf(stderr, "TOTAL OBJECT.C ALLOC: %zu\n", getBytes());
+    // eprintf("TOTAL OBJECT.C ALLOC: %zu\n", getBytes());
 }
 
 #endif