From 5f5e9ba46eea80c589b6675bf6d4f11f74af7d77 Mon Sep 17 00:00:00 2001
From: Franklin Wei <git@fwei.tk>
Date: Fri, 22 May 2015 16:51:01 -0400
Subject: some stuff, breaks save compatability

---
 src/globals.h |  5 +++++
 src/load.c    | 17 +++++++----------
 src/save.c    |  3 +--
 src/util.c    | 16 ++++++++++++++--
 4 files changed, 27 insertions(+), 14 deletions(-)

(limited to 'src')

diff --git a/src/globals.h b/src/globals.h
index c336aa4..9735657 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -8,6 +8,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <stdarg.h>
 
 #include <curl/curl.h>
 
@@ -23,6 +24,9 @@
 /* don't change this, it will corrupt existing saves */
 #define EPOCH_YEAR 2000
 
+#define SAVE_MAGIC "PORTv3"
+#define MAGIC_LEN 6
+
 typedef unsigned long long ullong;
 typedef unsigned long ulong;
 typedef unsigned int uint;
@@ -87,6 +91,7 @@ char *csv_read(char**);
 char *read_string(void);
 char *read_ticker(void);
 int compare_stocks(const void*, const void*);
+void fail(const char*, ...);;
 struct stock_t *find_stock(struct player_t*, char*);
 uint parse_args(struct player_t*, int argc, char *argv[]);
 uint16_t to_be16(uint16_t);
diff --git a/src/load.c b/src/load.c
index 733ad4d..35c7270 100644
--- a/src/load.c
+++ b/src/load.c
@@ -2,12 +2,12 @@
 
 /* NOTE: integers are represented internally by unsigned long long ints, but in the save they are always 64 bits */
 
-#define FAIL() exit(EXIT_FAILURE);
-
 static uint32_t cksum;
 
 #define ADD_CKSUM(x) (cksum += (x*x) + 1)
 
+#define FAIL() fail("Failed to read from file.")
+
 uint64_t read_be64(FILE *f)
 {
     uint64_t n;
@@ -94,11 +94,10 @@ void load_portfolio(struct player_t *player, const char *filename)
 
     FILE *f = fopen(filename, "rb");
 
-    char magic[6];
-    if(!f || ck_read(magic, 1, sizeof(magic), f) != 6 || memcmp(magic, "PORTv2", sizeof(magic)) != 0)
+    char magic[MAGIC_LEN];
+    if(!f || ck_read(magic, 1, sizeof(magic), f) != 6 || memcmp(magic, SAVE_MAGIC, sizeof(magic)) != 0)
     {
-        printf("FATAL: Failed to load save.\n");
-        exit(EXIT_FAILURE);
+        fail("Failed to load save.");
     }
 
     player->cash.cents = read_be64(f);
@@ -118,8 +117,7 @@ void load_portfolio(struct player_t *player, const char *filename)
         char *sym = malloc(symlen + 1);
         if(ck_read(sym, symlen + 1, 1, f) != 1)
         {
-            printf("FATAL: Save is corrupted (symbol too short).\n");
-            exit(EXIT_FAILURE);
+            fail("Save is corrupted (symbol too short).");
         }
 
         stock->symbol = sym;
@@ -163,8 +161,7 @@ void load_portfolio(struct player_t *player, const char *filename)
 
         if(ck != cksum)
         {
-            printf("FATAL: bad checksum, file is corrupt.\n%d %d", ck, cksum);
-            exit(EXIT_FAILURE);
+            fail("Bad checksum, file is corrupt.\nCalculated: %d File: %d", ck, cksum);
         }
 
         int junk = fgetc(f);
diff --git a/src/save.c b/src/save.c
index debe610..83e3713 100644
--- a/src/save.c
+++ b/src/save.c
@@ -76,8 +76,7 @@ void save_handler(struct player_t *player)
 
     cksum = 0;
 
-    const char *magic = "PORTv2";
-    ck_write(magic, strlen(magic), 1, f);
+    ck_write(SAVE_MAGIC, strlen(SAVE_MAGIC), 1, f);
 
     write_be64(f, player->cash.cents);
 
diff --git a/src/util.c b/src/util.c
index de1aaca..679fc4c 100644
--- a/src/util.c
+++ b/src/util.c
@@ -114,8 +114,7 @@ static void detect_endianness(void)
         endianness = LITTLE;
     else
     {
-        printf("FATAL: failed to detect system endianness!\n");
-        exit(EXIT_FAILURE);
+        fail("failed to detect system endianness");
     }
 }
 
@@ -322,3 +321,16 @@ uint parse_args(struct player_t *player, int argc, char *argv[])
 
     return ret;
 }
+
+void fail(const char *fmt, ...)
+{
+    va_list ap;
+    va_start(ap, fmt);
+    char buf[256];
+    vsnprintf(buf, sizeof(buf), fmt, ap);
+    va_end(ap);
+
+    fprintf(stderr, "FATAL: %s\n", buf);
+
+    exit(EXIT_FAILURE);
+}
-- 
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