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authorDenys Vlasenko <vda.linux@googlemail.com>2009-11-29 01:18:13 (GMT)
committer Denys Vlasenko <vda.linux@googlemail.com>2009-11-29 01:18:13 (GMT)
commit2ce42e98d799de4c3389d9c4ce0a6b0d42dac7cc (patch)
treee67de3ecd71317e5862211e1c44eb615debfe4c2
parent068d386a6c3901c24aba17676555a951c4c860a2 (diff)
downloadbusybox-2ce42e98d799de4c3389d9c4ce0a6b0d42dac7cc.tar.gz
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ash: more cosmetics and cleanups
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
-rw-r--r--shell/ash.c83
1 files changed, 35 insertions, 48 deletions
diff --git a/shell/ash.c b/shell/ash.c
index d716d40..a901221 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -446,6 +446,7 @@ out2str(const char *p)
/* ============ Parser structures */
/* control characters in argument strings */
+#define CTL_FIRST CTLESC
#define CTLESC ((unsigned char)'\201') /* escape next character */
#define CTLVAR ((unsigned char)'\202') /* variable defn */
#define CTLENDVAR ((unsigned char)'\203')
@@ -455,6 +456,7 @@ out2str(const char *p)
#define CTLARI ((unsigned char)'\206') /* arithmetic expression */
#define CTLENDARI ((unsigned char)'\207')
#define CTLQUOTEMARK ((unsigned char)'\210')
+#define CTL_LAST CTLQUOTEMARK
/* variable substitution byte (follows CTLVAR) */
#define VSTYPE 0x0f /* type of variable substitution */
@@ -2602,23 +2604,12 @@ pwdcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
#define CSPCL 13 /* these terminate a word */
#define CIGN 14 /* character should be ignored */
+#define PEOF 256
#if ENABLE_ASH_ALIAS
-# define PEOA 256
-# define PEOF 257
-#else
-# define PEOF 256
+# define PEOA 257
#endif
-/* number syntax index */
-#define BASESYNTAX 0 /* not in quotes */
-#define DQSYNTAX 1 /* in double quotes */
-#define SQSYNTAX 2 /* in single quotes */
-#define ARISYNTAX 3 /* in arithmetic */
-#define PSSYNTAX 4 /* prompt */
-
-#if ENABLE_ASH_OPTIMIZE_FOR_SIZE
-# define USE_SIT_FUNCTION
-#endif
+#define USE_SIT_FUNCTION ENABLE_ASH_OPTIMIZE_FOR_SIZE
#if ENABLE_SH_MATH_SUPPORT
# define SIT_ITEM(a,b,c,d) (a | (b << 4) | (c << 8) | (d << 12))
@@ -2640,7 +2631,7 @@ static const uint16_t S_I_T[] = {
SIT_ITEM(CBACK , CBACK , CCTL , CBACK ), /* 9, \ */
SIT_ITEM(CBQUOTE , CBQUOTE , CWORD, CBQUOTE), /* 10, ` */
SIT_ITEM(CENDVAR , CENDVAR , CWORD, CENDVAR), /* 11, } */
-#ifndef USE_SIT_FUNCTION
+#if !USE_SIT_FUNCTION
SIT_ITEM(CENDFILE, CENDFILE , CENDFILE, CENDFILE),/* 12, PEOF */
SIT_ITEM(CWORD , CWORD , CWORD, CWORD ), /* 13, 0-9A-Za-z */
SIT_ITEM(CCTL , CCTL , CCTL , CCTL ) /* 14, CTLESC ... */
@@ -2671,8 +2662,14 @@ enum {
/* c in SIT(c, syntax) must be an *unsigned char* or PEOA or PEOF,
* caller must ensure proper cast on it if c is *char_ptr!
*/
+/* Values for syntax param */
+#define BASESYNTAX 0 /* not in quotes */
+#define DQSYNTAX 1 /* in double quotes */
+#define SQSYNTAX 2 /* in single quotes */
+#define ARISYNTAX 3 /* in arithmetic */
+#define PSSYNTAX 4 /* prompt. never passed to SIT() */
-#ifdef USE_SIT_FUNCTION
+#if USE_SIT_FUNCTION
static int
SIT(int c, int syntax)
@@ -2696,24 +2693,24 @@ SIT(int c, int syntax)
const char *s;
int indx;
- if (c == PEOF) { /* 2^8+2 */
+ if (c == PEOF)
return CENDFILE;
- }
# if ENABLE_ASH_ALIAS
- if (c == PEOA) { /* 2^8+1 */
+ if (c == PEOA)
indx = 0;
- } else
+ else
# endif
{
- if ((unsigned char)c >= CTLESC
- && (unsigned char)c <= CTLQUOTEMARK
+ /* Cast is purely for paranoia here,
+ * just in case someone passed signed char to us */
+ if ((unsigned char)c >= CTL_FIRST
+ && (unsigned char)c <= CTL_LAST
) {
return CCTL;
}
s = strchrnul(spec_symbls, c);
- if (*s == '\0') {
+ if (*s == '\0')
return CWORD;
- }
indx = syntax_index_table[s - spec_symbls];
}
return (S_I_T[indx] >> (syntax*4)) & 0xf;
@@ -2979,13 +2976,13 @@ static const uint8_t syntax_index_table[] = {
/* 253 */ CWORD_CWORD_CWORD_CWORD,
/* 254 */ CWORD_CWORD_CWORD_CWORD,
/* 255 */ CWORD_CWORD_CWORD_CWORD,
+ /* PEOF */ CENDFILE_CENDFILE_CENDFILE_CENDFILE,
# if ENABLE_ASH_ALIAS
/* PEOA */ CSPCL_CIGN_CIGN_CIGN,
# endif
- /* PEOF */ CENDFILE_CENDFILE_CENDFILE_CENDFILE,
};
-# define SIT(c, syntax) ((S_I_T[syntax_index_table[c]] >> (syntax*4)) & 0xf)
+# define SIT(c, syntax) ((S_I_T[syntax_index_table[c]] >> ((syntax)*4)) & 0xf)
#endif /* !USE_SIT_FUNCTION */
@@ -9544,17 +9541,14 @@ pgetc(void)
}
#if ENABLE_ASH_OPTIMIZE_FOR_SIZE
-#define pgetc_fast() pgetc()
+# define pgetc_fast() pgetc()
#else
-#define pgetc_fast() pgetc_as_macro()
+# define pgetc_fast() pgetc_as_macro()
#endif
-/*
- * Same as pgetc(), but ignores PEOA.
- */
#if ENABLE_ASH_ALIAS
static int
-pgetc2(void)
+pgetc_without_PEOA(void)
{
int c;
do {
@@ -9567,7 +9561,7 @@ pgetc2(void)
return c;
}
#else
-#define pgetc2() pgetc()
+# define pgetc_without_PEOA() pgetc()
#endif
/*
@@ -9581,7 +9575,7 @@ pfgets(char *line, int len)
int c;
while (--nleft > 0) {
- c = pgetc2();
+ c = pgetc_without_PEOA();
if (c == PEOF) {
if (p == line)
return NULL;
@@ -10891,7 +10885,7 @@ readtoken1(int c, int syntax, char *eofmark, int striptabs)
USTPUTC(c, out);
break;
case CBACK: /* backslash */
- c = pgetc2();
+ c = pgetc_without_PEOA();
if (c == PEOF) {
USTPUTC(CTLESC, out);
USTPUTC('\\', out);
@@ -11005,9 +10999,7 @@ readtoken1(int c, int syntax, char *eofmark, int striptabs)
#endif
goto endword; /* exit outer loop */
}
-#if ENABLE_ASH_ALIAS
- if (c != PEOA)
-#endif
+ IF_ASH_ALIAS(if (c != PEOA))
USTPUTC(c, out);
}
@@ -11059,13 +11051,12 @@ readtoken1(int c, int syntax, char *eofmark, int striptabs)
checkend: {
if (eofmark) {
#if ENABLE_ASH_ALIAS
- if (c == PEOA) {
- c = pgetc2();
- }
+ if (c == PEOA)
+ c = pgetc_without_PEOA();
#endif
if (striptabs) {
while (c == '\t') {
- c = pgetc2();
+ c = pgetc_without_PEOA();
}
}
if (c == *eofmark) {
@@ -11377,9 +11368,7 @@ parsebackq: {
/* fall through */
case PEOF:
-#if ENABLE_ASH_ALIAS
- case PEOA:
-#endif
+ IF_ASH_ALIAS(case PEOA:)
startlinno = g_parsefile->linno;
raise_error_syntax("EOF in backquote substitution");
@@ -11596,9 +11585,7 @@ xxreadtoken(void)
c = pgetc_fast();
switch (c) {
case ' ': case '\t':
-#if ENABLE_ASH_ALIAS
- case PEOA:
-#endif
+ IF_ASH_ALIAS(case PEOA:)
continue;
case '#':
while ((c = pgetc()) != '\n' && c != PEOF)