[src/trunk]: src/usr.bin/make make(1): rename some fields of struct IFile

[rillig <rillig%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/49944532ab88
branches:  trunk
changeset: 977590:49944532ab88
user:      rillig <rillig%NetBSD.org@localhost>
date:      Wed Oct 28 00:44:39 2020 +0000

description:
make(1): rename some fields of struct IFile

The initial "P_" of these field names didn't match anything else.  The
documentation was missing the purpose of the buffer.  The start of the
buffer is only needed to free it later, so reflect that in the variable
name.

diffstat:

 usr.bin/make/parse.c |  39 ++++++++++++++++++++++-----------------
 1 files changed, 22 insertions(+), 17 deletions(-)

diffs (109 lines):

diff -r 2b031fe72a88 -r 49944532ab88 usr.bin/make/parse.c
--- a/usr.bin/make/parse.c      Wed Oct 28 00:38:37 2020 +0000
+++ b/usr.bin/make/parse.c      Wed Oct 28 00:44:39 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: parse.c,v 1.402 2020/10/28 00:38:37 rillig Exp $       */
+/*     $NetBSD: parse.c,v 1.403 2020/10/28 00:44:39 rillig Exp $       */
 
 /*
  * Copyright (c) 1988, 1989, 1990, 1993
@@ -117,7 +117,7 @@
 #include "pathnames.h"
 
 /*     "@(#)parse.c    8.3 (Berkeley) 3/19/94" */
-MAKE_RCSID("$NetBSD: parse.c,v 1.402 2020/10/28 00:38:37 rillig Exp $");
+MAKE_RCSID("$NetBSD: parse.c,v 1.403 2020/10/28 00:44:39 rillig Exp $");
 
 /* types and constants */
 
@@ -131,9 +131,12 @@
     int first_lineno;          /* line number of start of text */
     unsigned int cond_depth;   /* 'if' nesting when file opened */
     Boolean depending;         /* state of doing_depend on EOF */
-    char *P_str;               /* point to base of string buffer */
-    char *P_ptr;               /* point to next char of string buffer */
-    char *P_end;               /* point to the end of string buffer */
+
+    /* The buffer from which the file's content is read. */
+    char *buf_freeIt;
+    char *buf_ptr;             /* next char to be read */
+    char *buf_end;
+
     char *(*nextbuf)(void *, size_t *); /* Function to get more data */
     void *nextbuf_arg;         /* Opaque arg for nextbuf() */
     struct loadedfile *lf;     /* loadedfile object, if any */
@@ -2431,9 +2434,9 @@
        free(curFile);
        return;
     }
-    curFile->P_str = buf;
-    curFile->P_ptr = buf;
-    curFile->P_end = buf + len;
+    curFile->buf_freeIt = buf;
+    curFile->buf_ptr = buf;
+    curFile->buf_end = buf + len;
 
     curFile->cond_depth = Cond_save_depth();
     ParseSetParseFile(name);
@@ -2573,9 +2576,9 @@
     doing_depend = curFile->depending; /* restore this */
     /* get next input buffer, if any */
     ptr = curFile->nextbuf(curFile->nextbuf_arg, &len);
-    curFile->P_ptr = ptr;
-    curFile->P_str = ptr;
-    curFile->P_end = ptr + len;
+    curFile->buf_ptr = ptr;
+    curFile->buf_freeIt = ptr;
+    curFile->buf_end = ptr + len;
     curFile->lineno = curFile->first_lineno;
     if (ptr != NULL) {
        /* Iterate again */
@@ -2592,7 +2595,7 @@
 
     /* Dispose of curFile info */
     /* Leak curFile->fname because all the gnodes have pointers to it */
-    free(curFile->P_str);
+    free(curFile->buf_freeIt);
     free(curFile);
 
     if (includes.len == 0) {
@@ -2632,24 +2635,26 @@
     /* Loop through blank lines and comment lines */
     for (;;) {
        cf->lineno++;
-       line = cf->P_ptr;
+       line = cf->buf_ptr;
        ptr = line;
        line_end = line;
        escaped = NULL;
        comment = NULL;
        for (;;) {
-           if (cf->P_end != NULL && ptr == cf->P_end) {
+           /* XXX: can buf_end ever be null? */
+           if (cf->buf_end != NULL && ptr == cf->buf_end) {
                /* end of buffer */
                ch = 0;
                break;
            }
            ch = *ptr;
            if (ch == 0 || (ch == '\\' && ptr[1] == 0)) {
-               if (cf->P_end == NULL)
+               /* XXX: can buf_end ever be null? */
+               if (cf->buf_end == NULL)
                    /* End of string (aka for loop) data */
                    break;
                /* see if there is more we can parse */
-               while (ptr++ < cf->P_end) {
+               while (ptr++ < cf->buf_end) {
                    if ((ch = *ptr) == '\n') {
                        if (ptr > line && ptr[-1] == '\\')
                            continue;
@@ -2695,7 +2700,7 @@
        }
 
        /* Save next 'to be processed' location */
-       cf->P_ptr = ptr;
+       cf->buf_ptr = ptr;
 
        /* Check we have a non-comment, non-blank line */
        if (line_end == line || comment == line) {