From: Manuel Novoa III  <mjn3@codepoet.org>
Date: Tue, 11 Sep 2001 01:14:02 +0000 (-0000)
Subject: Commit my changes to xxreadtoken() to reduce code size.  Also set defines
X-Git-Tag: 0_60_2~165
X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=8d0afde412791c1bc35ced42a56ee27602678991;p=oweals%2Fbusybox.git

Commit my changes to xxreadtoken() to reduce code size.  Also set defines
so that the table implementations of copynode, calcsize, and cmdtxt are
used.  Hopefully this will result in wider testing.  ;-)  If it breaks,
just unset the appropriate defines.
---

diff --git a/ash.c b/ash.c
index 9b3f83ef6..8a213d876 100644
--- a/ash.c
+++ b/ash.c
@@ -7294,7 +7294,7 @@ cmdputs(const char *s)
 	cmdnextc = q;
 }
 
-//#define CMDTXT_TABLE
+#define CMDTXT_TABLE
 #ifdef CMDTXT_TABLE
 /*
  * To collect a lot of redundant code in cmdtxt() case statements, we
@@ -8710,8 +8710,8 @@ static void sizenodelist (const struct nodelist *);
 static struct nodelist *copynodelist (const struct nodelist *);
 static char *nodesavestr (const char *);
 
-//#define CALCSIZE_TABLE
-//#define COPYNODE_TABLE
+#define CALCSIZE_TABLE
+#define COPYNODE_TABLE
 #if defined(CALCSIZE_TABLE) || defined(COPYNODE_TABLE)
 /*
  * To collect a lot of redundant code in case statements for copynode()
@@ -10337,6 +10337,86 @@ out:
  *  have parseword (readtoken1?) handle both words and redirection.]
  */
 
+#define NEW_xxreadtoken
+#ifdef NEW_xxreadtoken
+
+static const char xxreadtoken_chars[] = "\n()&|;"; /* singles must be first! */
+static const char xxreadtoken_tokens[] = {
+	TNL, TLP, TRP,				/* only single occurrence allowed */
+	TBACKGND, TPIPE, TSEMI,		/* if single occurrence */
+	TEOF,						/* corresponds to trailing nul */
+	TAND, TOR, TENDCASE,		/* if double occurrence */
+};
+
+#define xxreadtoken_doubles \
+	(sizeof(xxreadtoken_tokens) - sizeof(xxreadtoken_chars))
+#define xxreadtoken_singles \
+	(sizeof(xxreadtoken_chars) - xxreadtoken_doubles - 1)
+
+static int
+xxreadtoken() {
+	int c;
+
+	if (tokpushback) {
+		tokpushback = 0;
+		return lasttoken;
+	}
+	if (needprompt) {
+		setprompt(2);
+		needprompt = 0;
+	}
+	startlinno = plinno;
+	for (;;) {      /* until token or start of word found */
+		c = pgetc_macro();
+
+		if ((c!=' ') && (c!='\t')
+#ifdef ASH_ALIAS
+			&& (c!=PEOA)
+#endif
+			) {
+			if (c=='#') {
+				while ((c = pgetc()) != '\n' && c != PEOF);
+				pungetc();
+			} else if (c=='\\') {
+				if (pgetc() != '\n') {
+					pungetc();
+					goto READTOKEN1;
+				}
+				startlinno = ++plinno;
+				setprompt(doprompt ? 2 : 0);
+			} else {
+				const char *p
+					= xxreadtoken_chars + sizeof(xxreadtoken_chars) - 1;
+
+				if (c!=PEOF) {
+					if (c=='\n') {
+						plinno++;
+						needprompt = doprompt;
+					}
+
+					p = strchr(xxreadtoken_chars, c);
+					if (p == NULL) {
+					READTOKEN1:
+						return readtoken1(c, BASESYNTAX, (char *)NULL, 0);
+					}
+			
+					if (p-xxreadtoken_chars >= xxreadtoken_singles) {
+						if (pgetc() == *p) { /* double occurrence? */
+							p += xxreadtoken_doubles + 1;
+						} else {
+							pungetc();
+						}
+					}
+				}
+
+				return lasttoken = xxreadtoken_tokens[p-xxreadtoken_chars];
+			}
+		}
+	}
+}
+
+
+#else
 #define RETURN(token)   return lasttoken = token
 
 static int
@@ -10408,7 +10488,7 @@ breakloop:
 	return readtoken1(c, BASESYNTAX, (char *)NULL, 0);
 #undef RETURN
 }
-
+#endif
 
 
 /*
@@ -12681,7 +12761,7 @@ findvar(struct var **vpp, const char *name)
 /*
  * Copyright (c) 1999 Herbert Xu <herbert@debian.org>
  * This file contains code for the times builtin.
- * $Id: ash.c,v 1.24 2001/09/06 18:00:41 andersen Exp $
+ * $Id: ash.c,v 1.25 2001/09/11 01:14:02 mjn3 Exp $
  */
 static int timescmd (int argc, char **argv)
 {
diff --git a/shell/ash.c b/shell/ash.c
index 9b3f83ef6..8a213d876 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -7294,7 +7294,7 @@ cmdputs(const char *s)
 	cmdnextc = q;
 }
 
-//#define CMDTXT_TABLE
+#define CMDTXT_TABLE
 #ifdef CMDTXT_TABLE
 /*
  * To collect a lot of redundant code in cmdtxt() case statements, we
@@ -8710,8 +8710,8 @@ static void sizenodelist (const struct nodelist *);
 static struct nodelist *copynodelist (const struct nodelist *);
 static char *nodesavestr (const char *);
 
-//#define CALCSIZE_TABLE
-//#define COPYNODE_TABLE
+#define CALCSIZE_TABLE
+#define COPYNODE_TABLE
 #if defined(CALCSIZE_TABLE) || defined(COPYNODE_TABLE)
 /*
  * To collect a lot of redundant code in case statements for copynode()
@@ -10337,6 +10337,86 @@ out:
  *  have parseword (readtoken1?) handle both words and redirection.]
  */
 
+#define NEW_xxreadtoken
+#ifdef NEW_xxreadtoken
+
+static const char xxreadtoken_chars[] = "\n()&|;"; /* singles must be first! */
+static const char xxreadtoken_tokens[] = {
+	TNL, TLP, TRP,				/* only single occurrence allowed */
+	TBACKGND, TPIPE, TSEMI,		/* if single occurrence */
+	TEOF,						/* corresponds to trailing nul */
+	TAND, TOR, TENDCASE,		/* if double occurrence */
+};
+
+#define xxreadtoken_doubles \
+	(sizeof(xxreadtoken_tokens) - sizeof(xxreadtoken_chars))
+#define xxreadtoken_singles \
+	(sizeof(xxreadtoken_chars) - xxreadtoken_doubles - 1)
+
+static int
+xxreadtoken() {
+	int c;
+
+	if (tokpushback) {
+		tokpushback = 0;
+		return lasttoken;
+	}
+	if (needprompt) {
+		setprompt(2);
+		needprompt = 0;
+	}
+	startlinno = plinno;
+	for (;;) {      /* until token or start of word found */
+		c = pgetc_macro();
+
+		if ((c!=' ') && (c!='\t')
+#ifdef ASH_ALIAS
+			&& (c!=PEOA)
+#endif
+			) {
+			if (c=='#') {
+				while ((c = pgetc()) != '\n' && c != PEOF);
+				pungetc();
+			} else if (c=='\\') {
+				if (pgetc() != '\n') {
+					pungetc();
+					goto READTOKEN1;
+				}
+				startlinno = ++plinno;
+				setprompt(doprompt ? 2 : 0);
+			} else {
+				const char *p
+					= xxreadtoken_chars + sizeof(xxreadtoken_chars) - 1;
+
+				if (c!=PEOF) {
+					if (c=='\n') {
+						plinno++;
+						needprompt = doprompt;
+					}
+
+					p = strchr(xxreadtoken_chars, c);
+					if (p == NULL) {
+					READTOKEN1:
+						return readtoken1(c, BASESYNTAX, (char *)NULL, 0);
+					}
+			
+					if (p-xxreadtoken_chars >= xxreadtoken_singles) {
+						if (pgetc() == *p) { /* double occurrence? */
+							p += xxreadtoken_doubles + 1;
+						} else {
+							pungetc();
+						}
+					}
+				}
+
+				return lasttoken = xxreadtoken_tokens[p-xxreadtoken_chars];
+			}
+		}
+	}
+}
+
+
+#else
 #define RETURN(token)   return lasttoken = token
 
 static int
@@ -10408,7 +10488,7 @@ breakloop:
 	return readtoken1(c, BASESYNTAX, (char *)NULL, 0);
 #undef RETURN
 }
-
+#endif
 
 
 /*
@@ -12681,7 +12761,7 @@ findvar(struct var **vpp, const char *name)
 /*
  * Copyright (c) 1999 Herbert Xu <herbert@debian.org>
  * This file contains code for the times builtin.
- * $Id: ash.c,v 1.24 2001/09/06 18:00:41 andersen Exp $
+ * $Id: ash.c,v 1.25 2001/09/11 01:14:02 mjn3 Exp $
  */
 static int timescmd (int argc, char **argv)
 {