scanner_scanpixels prototype

[henge/webcc.git] / src / apc / scanner.c

diff --git a/src/apc/scanner.c b/src/apc/scanner.c
index c669b10..a999c7b 100644 (file)
--- a/src/apc/scanner.c
+++ b/src/apc/scanner.c
@@ -19,12 +19,15 @@
 #include <stdlib.h> //exit
 #include <unistd.h> //chdir
 #include <dirent.h> //opendir
-
+/* Libs */
+#include <png.h>
+/* Internal */
 #include "parser.tab.h"
 /* Public */
-int  scanner_init(void);
-void scanner_quit(void);
-int  scanner(void);
+int   scanner_init(void);
+void  scanner_quit(void);
+int   scanner(void);
+int   scanner_scanpixels(int*,int);
 /* Private */
 #ifndef DL_STACKSIZE
 #define DL_STACKSIZE     64
@@ -110,8 +113,7 @@ void scanner_quit
    array, while placing all subdirectory entries in the current depth's child
    directory stack to be scanned later.
 
-   Returns the number of elements added to the lexer's file array, or -1 on
-   error
+   Returns the number of tokens generated on success, -1 on error.
 */
 int scanner
 #define $($)#$ //stringifier
@@ -121,12 +123,11 @@ int scanner
 #define ERR_DEPTH  "Fatal: Maximum directory depth of " $(DL_STACKSIZE) \
   " exceeded during directory scan\n"
 #define ERR_DL     "Fatal: Directory List Stack Corruption %x\n", DL_LEN()
-#define TOK_CLOPEN  0x55, 1 //TODO
-#define TOK_CLCLOSE 0x56, 1 //TODO
 ()
 { struct dirent* direntp;
   struct DIR* DIRp;
- parse:
+  int ntok = 0;
+ scan:
   if (DL_CD_LEN() >= DL_CD_STACKSIZE)//fail if maxchildren exceeded
     { fprintf(stderr, ERR_CHILD);
       goto fail;
@@ -134,8 +135,7 @@ int scanner
   if (DL_CD_LEN() > 0)               //There are entities to process
     { if ((direntp = DL_CD_POP()) == NULL)//If the dirent is null, the library
         goto libfail;                     //function in dirent has failed
-      printf("Lexdir %s\n",direntp->d_name);
-      lexer_lex(direntp->d_name);         //lex the directory name
+      ntok += lexer_lex(direntp->d_name); //lex the directory name
       if (DL_LEN() >= DL_STACKSIZE)       //fail if maxdepth exceeded
         { fprintf(stderr, ERR_DEPTH);
           goto fail;
@@ -145,23 +145,27 @@ int scanner
       DL_PUSH(opendir(CWDSTR));
       if (DL_CURDIR() == NULL)            //open the cwd
        goto libfail;
-      lexer_pushtok(TOK_CLOPEN);          //Push "Open Directory" token
+      lexer_pushtok(CLOPEN, 0);           //Push "Open Directory" token
+      ntok++;
       return dredge_current_depth();      //Filter and sort the current depth
     }
   else if (DL_LEN() >= 0)            //Any dirs left? (Including root)
     { if (closedir(DL_POP()))             //close the directory we just left
         goto libfail;
       if (DL_LEN() == -1)                 //If we just popped root,
-        return 0;                         //we're done
-      lexer_pushtok(TOK_CLCLOSE);         //Else push "Close Directory" token,
+        goto done;                        //we're done
+      lexer_pushtok(CLCLOSE, 0);          //Else push "Close Directory" token,
+      ntok++;
       if (!chdir(".."))                   //move up a directory and
-        goto parse;                       //start over
+        goto scan;                        //start over
     }
   fprintf(stderr, ERR_DL);
  libfail:
   perror("parsedir");
  fail:
-  exit(EXIT_FAILURE);
+  return -1;
+ done:
+  return ntok;
 }
 
 /* Directory Entity Sort and Filter (Dredge)
@@ -173,7 +177,7 @@ int scanner
    Returns -1 if 'readdir' encounters an error, otherwise returns the number of
    directory entries sent to the external 'lexer_direntpa' array.
 */
-typedef
+typedef //so we can typecast dirent's 'alphasort()' to take const void*s
 int (*qcomp)(const void*, const void*);
 static inline
 int dredge_current_depth
@@ -209,3 +213,19 @@ int dredge_current_depth
   return DPS_LEN();
 }
 
+
+/* Scan Pixels 
+   Scans up to 'len' pixels from the current file into 'buf'.
+   Returns the number of pixels scanned from the file, or -1 on error.
+*/
+int scanner_scanpixels
+( int* buf,
+  int x
+)
+{ int pixels = 0;
+  //Open the current file if not yet open
+    //Identify file type
+    //Verify file contents and header
+  //Read pixels into buffer
+  return pixels;
+}