Restructured code into src/<module>

[tpg/opendispense2.git] / src / server / itemdb.c

diff --git a/src/server/itemdb.c b/src/server/itemdb.c
new file mode 100644 (file)
index 0000000..0cb932d
--- /dev/null
+++ b/src/server/itemdb.c
@@ -0,0 +1,152 @@
+/*
+ * OpenDispense 2 
+ * UCC (University [of WA] Computer Club) Electronic Accounting System
+ *
+ * itemdb.c - Dispense Item Databse
+ *
+ * This file is licenced under the 3-clause BSD Licence. See the file COPYING
+ * for full details.
+ */
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <ctype.h>
+#include "common.h"
+#include <regex.h>
+
+// === IMPORTS ===
+extern tHandler        gCoke_Handler;
+
+// === PROTOTYPES ===
+void   Load_Itemlist(void);
+char   *trim(char *__str);
+
+// === GLOBALS ===
+ int   giNumItems = 0;
+tItem  *gaItems = NULL;
+tHandler       gPseudo_Handler = {Name:"pseudo"};
+tHandler       *gaHandlers[] = {&gPseudo_Handler, &gCoke_Handler};
+ int   giNumHandlers = sizeof(gaHandlers)/sizeof(gaHandlers[0]);
+char   *gsItemListFile = DEFAULT_ITEM_FILE;
+
+// === CODE ===
+/**
+ * \brief Read the item list from disk
+ */
+void Load_Itemlist(void)
+{
+       FILE    *fp = fopen(gsItemListFile, "r");
+       char    buffer[BUFSIZ];
+       char    *line;
+        int    lineNum = 0;
+        int    i;
+       regex_t regex;
+       regmatch_t      matches[5];
+       
+       i = regcomp(&regex, "^([a-zA-Z][a-zA-Z0-9]*)\\s+([0-9]+)\\s+([0-9]+)\\s+(.*)", REG_EXTENDED);
+       if( i )
+       {
+               size_t  len = regerror(i, &regex, NULL, 0);
+               char    *errorStr = malloc(len);
+               regerror(i, &regex, errorStr, len);
+               fprintf(stderr, "Rexex compilation failed - %s\n", errorStr);
+               free(errorStr);
+               exit(-1);
+       }
+
+       // Error check
+       if(!fp) {
+               fprintf(stderr, "Unable to open item file '%s'\n", gsItemListFile);
+               perror("Unable to open item file");
+       }
+       
+       while( fgets(buffer, BUFSIZ, fp) )
+       {
+               char    *tmp;
+               char    *type, *desc;
+                int    num, price;
+               tHandler        *handler;
+
+               lineNum ++;
+
+               // Remove comments
+               tmp = strchr(buffer, '#');
+               if(tmp) *tmp = '\0';
+               tmp = strchr(buffer, ';');
+               if(tmp) *tmp = '\0';
+               
+               // Trim whitespace
+               line = trim(buffer);
+               
+               if(strlen(line) == 0)   continue;
+               
+               // Pass regex over line
+               if( (i = regexec(&regex, line, 5, matches, 0)) ) {
+                       size_t  len = regerror(i, &regex, NULL, 0);
+                       char    *errorStr = malloc(len);
+                       regerror(i, &regex, errorStr, len);
+                       fprintf(stderr, "Syntax error on line %i of item file '%s'\n%s", lineNum, gsItemListFile, errorStr);
+                       free(errorStr);
+                       exit(-1);
+               }
+
+               // Read line data
+               type  = line + matches[1].rm_so;        line[ matches[1].rm_eo ] = '\0';
+               num   = atoi( line + matches[2].rm_so );
+               price = atoi( line + matches[3].rm_so );
+               desc  = line + matches[4].rm_so;        
+
+               printf("Item '%s' - %i cents, %s:%i\n", desc, price, type, num);
+
+               handler = NULL;
+               for( i = 0; i < giNumHandlers; i ++ )
+               {
+                       if( strcmp(type, gaHandlers[i]->Name) == 0 ) {
+                               handler = gaHandlers[i];
+                               break;
+                       }
+               }
+
+               if( !handler ) {
+                       fprintf(stderr, "Unknow item type '%s' on line %i (%s)\n", type, lineNum, desc);
+                       continue ;
+               }
+
+               for( i = 0; i < giNumItems; i ++ )
+               {
+                       if( gaItems[i].Handler != handler )     continue;
+                       if( gaItems[i].ID != num )      continue;
+
+                       printf("Redefinition of %s:%i, updated\n", handler->Name, num);
+                       gaItems[i].Price = price;
+                       free(gaItems[i].Name);
+                       gaItems[i].Name = strdup(desc);
+                       break;
+               }
+               if( i < giNumItems )    continue;
+
+               gaItems = realloc( gaItems, (giNumItems + 1)*sizeof(gaItems[0]) );
+               gaItems[giNumItems].Handler = handler;
+               gaItems[giNumItems].ID = num;
+               gaItems[giNumItems].Price = price;
+               gaItems[giNumItems].Name = strdup(desc);
+               giNumItems ++;
+       }       
+}
+
+char *trim(char *__str)
+{
+       char    *ret;
+        int    i;
+       
+       while( isspace(*__str) )
+               __str++;
+       ret = __str;
+
+       i = strlen(ret);
+       while( i-- && isspace(__str[i]) ) {
+               __str[i] = '\0';
+       }
+
+       return ret;
+}