Minuscule code cleanup.

p4raw-id: //depot/perl@21205

diff --git a/doio.c b/doio.c
index 353e2a9..0c10519 100644 (file)
--- a/doio.c
+++ b/doio.c
@@ -94,7 +94,7 @@ Perl_do_openn(pTHX_ GV *gv, register char *name, I32 len, int as_raw,
 
     /* Collect default raw/crlf info from the op */
     if (PL_op && PL_op->op_type == OP_OPEN) {
-       /* set up disciplines */
+       /* set up IO layers */
        U8 flags = PL_op->op_private;
        in_raw = (flags & OPpOPEN_IN_RAW);
        in_crlf = (flags & OPpOPEN_IN_CRLF);
@@ -212,7 +212,7 @@ Perl_do_openn(pTHX_ GV *gv, register char *name, I32 len, int as_raw,
            *--tend = '\0';
 
        if (num_svs) {
-           /* New style explict name, type is just mode and discipline/layer info */
+           /* New style explicit name, type is just mode and layer info */
            STRLEN l = 0;
 #ifdef USE_STDIO
            if (SvROK(*svp) && !strchr(name,'&')) {
@@ -236,7 +236,7 @@ Perl_do_openn(pTHX_ GV *gv, register char *name, I32 len, int as_raw,
        if ((*type == IoTYPE_RDWR) && /* scary */
            (*(type+1) == IoTYPE_RDONLY || *(type+1) == IoTYPE_WRONLY) &&
            ((!num_svs || (tend > type+1 && tend[-1] != IoTYPE_PIPE)))) {
-        TAINT_PROPER("open");
+           TAINT_PROPER("open");
            mode[1] = *type++;
            writing = 1;
        }
@@ -244,7 +244,7 @@ Perl_do_openn(pTHX_ GV *gv, register char *name, I32 len, int as_raw,
        if (*type == IoTYPE_PIPE) {
            if (num_svs) {
                if (type[1] != IoTYPE_STD) {
-                 unknown_desr:
+                 unknown_open_mode:
                    Perl_croak(aTHX_ "Unknown open() mode '%.*s'", (int)olen, oname);
                }
                type++;
@@ -289,7 +289,7 @@ Perl_do_openn(pTHX_ GV *gv, register char *name, I32 len, int as_raw,
                    }
                }
            }
-       }
+       } /* IoTYPE_PIPE */
        else if (*type == IoTYPE_WRONLY) {
            TAINT_PROPER("open");
            type++;
@@ -422,7 +422,7 @@ Perl_do_openn(pTHX_ GV *gv, register char *name, I32 len, int as_raw,
                    fp = PerlIO_openn(aTHX_ type,mode,-1,0,0,NULL,num_svs,svp);
                }
            } /* !& */
-       }
+       } /* IoTYPE_WRONLY */
        else if (*type == IoTYPE_RDONLY) {
            /*SUPPRESS 530*/
            for (type++; isSPACE(*type); type++) ;
@@ -453,8 +453,9 @@ Perl_do_openn(pTHX_ GV *gv, register char *name, I32 len, int as_raw,
                }
                fp = PerlIO_openn(aTHX_ type,mode,-1,0,0,NULL,num_svs,svp);
            }
-       }
-       else if ((num_svs && type[0] == IoTYPE_STD && type[1] == IoTYPE_PIPE) ||
+       } /* IoTYPE_RDONLY */
+       else if ((num_svs && /* '-|...' or '...|' */
+                 type[0] == IoTYPE_STD && type[1] == IoTYPE_PIPE) ||
                 (!num_svs && tend > type+1 && tend[-1] == IoTYPE_PIPE)) {
            if (num_svs) {
                type += 2;   /* skip over '-|' */
@@ -499,9 +500,9 @@ Perl_do_openn(pTHX_ GV *gv, register char *name, I32 len, int as_raw,
                }
            }
        }
-       else {
+       else { /* layer(Args) */
            if (num_svs)
-               goto unknown_desr;
+               goto unknown_open_mode;
            name = type;
            IoTYPE(io) = IoTYPE_RDONLY;
            /*SUPPRESS 530*/