avoid some use of literal 0 for a pointer

We can write this clearer as NULL.

diff --git a/lib/gvpr/parse.c b/lib/gvpr/parse.c
index 31b0477617c94c26e03ae97ba780f64606267638..1ff619d6534312586b0ecde1689d69c525353132 100644 (file)
--- a/lib/gvpr/parse.c
+++ b/lib/gvpr/parse.c
@@ -422,7 +422,7 @@ static case_info *addCase(case_info * last, char *guard, int gline,
     item = newof(0, case_info, 1, 0);
     item->guard = guard;
     item->action = action;
-    item->next = 0;
+    item->next = NULL;
     if (guard)
        item->gstart = gline;
     if (action)
@@ -463,12 +463,12 @@ parse_prog *parseProg(char *input, int isFile)
     char *guard = NULL;
     char *action = NULL;
     bool more;
-    parse_block *blocklist = 0;
-    case_info *edgelist = 0;
-    case_info *nodelist = 0;
-    parse_block *blockl = 0;
-    case_info *edgel = 0;
-    case_info *nodel = 0;
+    parse_block *blocklist = NULL;
+    case_info *edgelist = NULL;
+    case_info *nodelist = NULL;
+    parse_block *blockl = NULL;
+    case_info *edgel = NULL;
+    case_info *nodel = NULL;
     int n_blocks = 0;
     int n_nstmts = 0;
     int n_estmts = 0;
@@ -481,7 +481,7 @@ parse_prog *parseProg(char *input, int isFile)
     prog = newof(0, parse_prog, 1, 0);
     if (!prog) {
        error(ERROR_ERROR, "parseProg: out of memory");
-       return 0;
+       return NULL;
     }
 
     if (isFile) {
@@ -490,7 +490,7 @@ parse_prog *parseProg(char *input, int isFile)
        
     } else {
        mode = "rs";
-       prog->source = 0;       /* command line */
+       prog->source = NULL;    /* command line */
     }
 
     str = sfopen(0, input, mode);
@@ -500,10 +500,10 @@ parse_prog *parseProg(char *input, int isFile)
        else
            error(ERROR_ERROR, "parseProg : unable to create sfio stream");
        free (prog);
-       return 0;
+       return NULL;
     }
     
-    begg_stmt = 0;
+    begg_stmt = NULL;
     more = true;
     while (more) {
        switch (parseCase(str, &guard, &gline, &action, &line)) {
@@ -520,8 +520,8 @@ parse_prog *parseProg(char *input, int isFile)
 
                /* reset values */
                n_nstmts = n_estmts = 0;
-               edgel = nodel = edgelist = nodelist = 0;
-               begg_stmt = 0;
+               edgel = nodel = edgelist = nodelist = NULL;
+               begg_stmt = NULL;
            }
            bindAction(BeginG, action, line, &begg_stmt, &l_beging);
            break;
@@ -565,7 +565,7 @@ parse_prog *parseProg(char *input, int isFile)
 
     if (getErrorErrors ()) {
        freeParseProg (prog);
-       prog = 0;
+       prog = NULL;
     }
 
     return prog;