Starting cleanup of code.

[pd_readline] / history.c

diff --git a/history.c b/history.c
new file mode 100644 (file)
index 0000000..f8a0d25
--- /dev/null
+++ b/history.c
@@ -0,0 +1,65 @@
+
+
+/*  history.c                                          */ 
+/*  Command history.                                   */ 
+/*  This code is released to the public domain.        */ 
+/*  "Share and enjoy...."  ;)                          */  
+/*  See the UNLICENSE file for details.                */ 
+
+
+
+/*  Helper function, to let us see if a file */ 
+/*  exists in the current directory.  */ 
+int fexists(char *fname)
+{  
+   FILE *fptr;  
+   fptr = fopen(fname, "r") ;     
+   if ( !fptr )  return -1 ;  /* File does not exist in dir. */                 
+   fclose(fptr);  
+   return 0;    /* File DOES exist in dir.  */   
+} 
+
+
+/* Helper function to chop newlines off the lines read in. */ 
+/* Without this being done, an extra newline is inserted */ 
+/* (which is usually not what is wanted). */ 
+char *chop(char *s)
+{
+  s[strcspn(s,"\n")] = '\0'; 
+  return s; 
+}
+
+
+/* An array to store the command-history file in. */ 
+/* Only 20 lines are read. */ 
+char hist[20][80];  
+
+
+
+/* Read the file into the array of strings.  */ 
+void readhistory(char *fname) 
+{ 
+   int retval = fexists(fname); 
+        
+   int i; 
+   if (retval == 0) { 
+         /* File exists, so open it. */  
+         /* We open it in read-write mode so we can */ 
+         /* append new commands to it. */ 
+         FILE *fptr;  
+         fptr = fopen(fname, "rw"); 
+                          
+         for(i=0; i<20; i++)  
+         {  
+               chop(fgets(hist[i], 80, fptr) );  
+         }
+         
+   }  /* retval == 0  */          
+       
+       else puts("Error! File does not exist. \n");  
+       
+}      
+
+
+
+