symbollib: S_read -> const char *

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@47486 15284696-431f-4ddb-bdfa-cd5b030d7da7

include/symbol.h

@@ -72,7 +72,7 @@ typedef struct
 } SYMBOL;
 
 /* prototypes */
-SYMBOL *S_read(char *sname);
+SYMBOL *S_read(const char *sname);
 void S_stroke(SYMBOL * symb, double size, double rotation, int tolerance);
 
 #endif

lib/symbol/read.c

@@ -232,7 +232,7 @@ SYMBOL *err(FILE * fp, SYMBOL * s, char *msg)
  *  S_read() searches first in mapsets (standard GRASS search) and
  *   then in GISBASE/etc/symbol/ 
  */
-SYMBOL *S_read(char *sname)
+SYMBOL *S_read(const char *sname)
 {
     int i, j, k, l;
     FILE *fp;