From 55a7afdedc7cee2df9012f600dd51aff92ad1af3 Mon Sep 17 00:00:00 2001
From: deva <deva>
Date: Tue, 5 Apr 2005 11:22:05 +0000
Subject: Added validity checking on the conf parser. Added error object to
 conf parser. Cleaned up the configure.in script

---
 src/miav_config.cc | 65 +++++++++++++++++++++++++++++++++++++++++++-----------
 1 file changed, 52 insertions(+), 13 deletions(-)

(limited to 'src/miav_config.cc')

diff --git a/src/miav_config.cc b/src/miav_config.cc
index 1c2d0c6..8a9307d 100644
--- a/src/miav_config.cc
+++ b/src/miav_config.cc
@@ -26,15 +26,20 @@
 #include <config.h>
 #include "miav_config.h"
 
-MiavConfig::MiavConfig(char *file)
+MiavConfig::MiavConfig(char *file, Error* err)
 {
+  error = err;
   configs = NULL;
+  
+  filename = string(file);
 
   // Read config file
   FILE* fp = fopen(file, "r");
   
   if(!fp) {
-    fprintf(stderr, "Error reading configuration file %s\n", file);
+    char errbuf[256];
+    sprintf(errbuf, "Error reading configuration file %s\n", file);
+    if(error) error->pushError(errbuf);
     return;
   }
   fseek(fp, 0, SEEK_END);
@@ -63,16 +68,39 @@ MiavConfig::~MiavConfig()
   if(die) free(die);
 }
 
+/**
+ * Prints a reasonable error message when a parse error occurres.
+ */
+_cfg *MiavConfig::parseError(char* msg, char* line)
+{
+  char errbuf[512];
+  sprintf(errbuf, "Error parsing file %s at line:\n\t%s\n\t%s\n", filename.c_str(), line, msg);
+  if(error) error->pushError(errbuf);
+  return NULL;
+}
+
 /** 
  * Adds one configuration entry, from a single zero terminated line.
  */
 _cfg *MiavConfig::addConfig(_cfg *parent, char* conf)
 {
+  // Check for wellformed input:
+  // Check for =
+  if(strstr(conf, "=") == 0) return parseError("Missing '='", conf);
+  /*
+  if(strstr(conf, "\"")) {
+    if(strstr(conf, "=") > strstr(conf, "\""))
+    return parseError("Missing '=', first occurrence inside string", conf);
+  }
+  */
 
-  //
-  // FIXME: Check for wellformedness
-  //
+  // Check for nonempty left side
+  if(strstr(conf, "=") == conf) return parseError("Empty left side", conf);
 
+  // Check for nonempty right side
+  if(strstr(conf, "=") == conf + strlen(conf) - 1) return parseError("Empty right side.", conf);
+
+  // Parse this wellformed input.
   _cfg *cfg;
 
   cfg = (_cfg*) malloc(sizeof(_cfg));
@@ -86,6 +114,8 @@ _cfg *MiavConfig::addConfig(_cfg *parent, char* conf)
   char* val = (char*)calloc(vallen + 1, 1);
   strncpy(val, conf + strlen(conf) - vallen, vallen);
 
+  // TODO: Check valid rightside (true, false, number or "..")
+
   cfg->name = new string((const char*)name);
   free(name);
 
@@ -118,13 +148,12 @@ int MiavConfig::parse(char* raw)
   for(p = conf; p < conf_end; p++) {
     if(*p == '\n') {
       *p = '\0';
-      cfg = addConfig(cfg, start);
+      if(!(cfg = addConfig(cfg, start))) return 1;
       start = p+1;
     }
   }
   // Allocated in strip
   free(conf);
-  printf("done!\n");
   return 0;
 }
 
@@ -186,22 +215,30 @@ char* MiavConfig::strip(char* conf)
 
 int MiavConfig::readInt(char *node)
 {
-  return findNode(node)->intval;
+  _cfg* n = findNode(node);
+  if(n) return n->intval;
+  else return 0;
 }
 
 bool MiavConfig::readBool(char *node)
 {
-  return findNode(node)->boolval;
+  _cfg* n = findNode(node);
+  if(n) return n->boolval;
+  else return false;
 }
 
 string *MiavConfig::readString(char *node)
 {
-  return findNode(node)->stringval;
+  _cfg* n = findNode(node);
+  if(n) return n->stringval;
+  else return &emptyString;
 }
 
 float MiavConfig::readFloat(char *node)
 {
-  return findNode(node)->floatval;
+  _cfg* n = findNode(node);
+  if(n) return n->floatval;
+  else return 0.0f;
 }
 
 _cfg *MiavConfig::findNode(char* node)
@@ -212,6 +249,8 @@ _cfg *MiavConfig::findNode(char* node)
     if(!strcmp(node, cfg->name->c_str())) return cfg;
     cfg = cfg->next;
   }
-  fprintf(stderr, "ERROR: Request for nonexisting node \"%s\"!\n", node);
-  exit(1);
+  char errbuf[256];
+  sprintf(errbuf, "Request for nonexisting node \"%s\"!\n", node);
+  if(error) error->pushError(errbuf);
+  return NULL;
 }
-- 
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