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authorGravatar Denis Vlasenko <vda.linux@googlemail.com>2008-03-02 12:49:39 +0000
committerGravatar Denis Vlasenko <vda.linux@googlemail.com>2008-03-02 12:49:39 +0000
commit509697f00df5286674fdbdf7b02a57fea83636d0 (patch)
tree8c66aaf36eb6248bb8a212dfff05ea96608d93c8 /shell
parentda8ae753400906fdd236699bfcb60975ec659aa7 (diff)
downloadbusybox-509697f00df5286674fdbdf7b02a57fea83636d0.tar.gz
busybox-509697f00df5286674fdbdf7b02a57fea83636d0.tar.bz2
msh: renames: ->words => ->op_words, space() => get_space()
msh: simplify glob0/glob1/glob2/glob3 get_space - 26 +26 glob3 35 34 -1 glob2 28 27 -1 strsave 55 53 -2 globv 4 - -4 func 4 - -4 xstrcmp 25 12 -13 dodot 178 164 -14 rexecve 272 257 -15 space 26 - -26 glob1 292 256 -36 expand 2246 2209 -37 ------------------------------------------------------------------------------ (add/remove: 1/3 grow/shrink: 0/8 up/down: 26/-153) Total: -127 bytes
Diffstat (limited to 'shell')
-rw-r--r--shell/msh.c206
1 files changed, 99 insertions, 107 deletions
diff --git a/shell/msh.c b/shell/msh.c
index e98c6017a..cde18d08f 100644
--- a/shell/msh.c
+++ b/shell/msh.c
@@ -90,7 +90,7 @@ static char *itoa(int n)
//#define MSHDEBUG 4
#ifdef MSHDEBUG
-int mshdbg = MSHDEBUG;
+static int mshdbg = MSHDEBUG;
#define DBGPRINTF(x) if (mshdbg>0) printf x
#define DBGPRINTF0(x) if (mshdbg>0) printf x
@@ -104,7 +104,7 @@ int mshdbg = MSHDEBUG;
#define DBGPRINTF8(x) if (mshdbg>8) printf x
#define DBGPRINTF9(x) if (mshdbg>9) printf x
-int mshdbg_rc = 0;
+static int mshdbg_rc = 0;
#define RCPRINTF(x) if (mshdbg_rc) printf x
@@ -195,7 +195,7 @@ struct ioword {
*/
struct op {
smallint type; /* operation type, see Txxxx below */
- char **words; /* arguments to a command */
+ char **op_words; /* arguments to a command */
struct ioword **ioact; /* IO actions (eg, < > >>) */
struct op *left;
struct op *right;
@@ -528,8 +528,8 @@ static void globname(char *we, char *pp);
static char *generate(char *start1, char *end1, char *middle, char *end);
static int anyspcl(struct wdblock *wb);
static int xstrcmp(char *p1, char *p2);
-static void glob0(char *a0, unsigned a1, int a2,
- int (*a3) (char *, char *));
+static void glob0(char *a0, unsigned a1
+ /*, int item_sz, int (*f)(char *, char *) */);
static void readhere(char **name, char *s, int ec);
static int xxchar(struct ioarg *ap);
@@ -722,17 +722,7 @@ struct globals {
#define RUN(what, arg, gen) ((temparg.what = (arg)), run(&temparg, (gen)))
#ifdef MSHDEBUG
-void print_t(struct op *t)
-{
- DBGPRINTF(("T: t=%p, type %s, words=%p, IOword=%p\n", t,
- T_CMD_NAMES[t->type], t->words, t->ioact));
-
- if (t->words) {
- DBGPRINTF(("T: W1: %s", t->words[0]));
- }
-}
-
-void print_tree(struct op *head)
+static void print_tree(struct op *head)
{
if (head == NULL) {
DBGPRINTF(("PRINT_TREE: no tree\n"));
@@ -1002,7 +992,7 @@ static void garbage(void)
#endif
}
-static char *space(int n)
+static void *get_space(int n)
{
char *cp;
@@ -1016,7 +1006,7 @@ static char *strsave(const char *s, int a)
{
char *cp;
- cp = space(strlen(s) + 1);
+ cp = get_space(strlen(s) + 1);
if (cp == NULL) {
// FIXME: I highly doubt this is good.
return (char*)"";
@@ -1074,8 +1064,8 @@ static struct var *lookup(const char *n)
return vp;
cp = findeq(n);
- vp = (struct var *) space(sizeof(*vp));
- if (vp == 0 || (vp->name = space((int) (cp - n) + 2)) == 0) {
+ vp = get_space(sizeof(*vp));
+ if (vp == 0 || (vp->name = get_space((int) (cp - n) + 2)) == NULL) {
dummy.name = dummy.value = (char*)"";
return &dummy;
}
@@ -1116,7 +1106,7 @@ static void nameval(struct var *vp, const char *val, const char *name)
}
fl = 0;
if (name == NULL) {
- xp = space(strlen(vp->name) + strlen(val) + 2);
+ xp = get_space(strlen(vp->name) + strlen(val) + 2);
if (xp == NULL)
return;
/* make string: name=value */
@@ -1310,12 +1300,12 @@ struct op *scantree(struct op *head)
return dotnode;
}
- if (head->words == NULL)
+ if (head->op_words == NULL)
return NULL;
DBGPRINTF5(("SCANTREE: checking node %p\n", head));
- if ((head->type != TDOT) && LONE_CHAR(head->words[0], '.')) {
+ if ((head->type != TDOT) && LONE_CHAR(head->op_words[0], '.')) {
DBGPRINTF5(("SCANTREE: dot found in node %p\n", head));
return head;
}
@@ -1398,7 +1388,7 @@ static int newenv(int f)
return 1;
}
- ep = (struct env *) space(sizeof(*ep));
+ ep = get_space(sizeof(*ep));
if (ep == NULL) {
while (global_env.oenv)
quitenv();
@@ -1664,8 +1654,8 @@ static struct op *c_list(void)
t = block(TASYNC, t, NOBLOCK, NOWORDS);
while ((c = yylex(0)) == ';' || c == '&'
- || (multiline && c == '\n')) {
-
+ || (multiline && c == '\n')
+ ) {
p = andor();
if (p== NULL)
return t;
@@ -1807,7 +1797,7 @@ static struct op *command(int cf)
startl = 1;
t->str = yylval.cp;
multiline++;
- t->words = wordlist();
+ t->op_words = wordlist();
c = yylex(0);
if (c != '\n' && c != ';')
peeksym = c;
@@ -1822,7 +1812,7 @@ static struct op *command(int cf)
t->type = (c == WHILE ? TWHILE : TUNTIL);
t->left = c_list();
t->right = dogroup(1);
- /* t->words = NULL; - newtp() did this */
+ /* t->op_words = NULL; - newtp() did this */
multiline--;
break;
@@ -1856,17 +1846,18 @@ static struct op *command(int cf)
t = newtp();
t->type = TDOT;
- musthave(WORD, 0); /* gets name of file */
+ musthave(WORD, 0); /* gets name of file */
DBGPRINTF7(("COMMAND: DOT clause, yylval.cp is %s\n", yylval.cp));
- word(yylval.cp); /* add word to wdlist */
- word(NOWORD); /* terminate wdlist */
- t->words = copyw(); /* dup wdlist */
+ word(yylval.cp); /* add word to wdlist */
+ word(NOWORD); /* terminate wdlist */
+ t->op_words = copyw(); /* dup wdlist */
break;
}
- while (synio(0));
+ while (synio(0))
+ continue;
t = namelist(t);
iolist = iosave;
@@ -1971,7 +1962,7 @@ static struct op *casepart(void)
t = newtp();
t->type = TPAT;
- t->words = pattern();
+ t->op_words = pattern();
musthave(')', 0);
t->left = c_list();
peeksym = yylex(CONTIN);
@@ -2042,7 +2033,7 @@ static struct op *block(int type, struct op *t1, struct op *t2, char **wp)
t->type = type;
t->left = t1;
t->right = t2;
- t->words = wp;
+ t->op_words = wp;
DBGPRINTF7(("BLOCK: inserted %p between %p and %p\n", t, t1, t2));
@@ -2126,7 +2117,7 @@ static struct op *namelist(struct op *t)
}
word(NOWORD);
- t->words = copyw();
+ t->op_words = copyw();
return t;
}
@@ -2190,7 +2181,7 @@ static int yylex(int cf)
loop:
while ((c = my_getc(0)) == ' ' || c == '\t') /* Skip whitespace */
- ;
+ continue;
switch (c) {
default:
@@ -2207,7 +2198,8 @@ static int yylex(int cf)
break;
case '#': /* Comment, skip to next newline or End-of-string */
- while ((c = my_getc(0)) != '\0' && c != '\n');
+ while ((c = my_getc(0)) != '\0' && c != '\n')
+ continue;
unget(c);
goto loop;
@@ -2424,7 +2416,7 @@ static struct op **find1case(struct op *t, const char *w)
} else
t1 = t;
- for (wp = t1->words; *wp;) {
+ for (wp = t1->op_words; *wp;) {
cp = evalstr(*wp++, DOSUB);
if (cp && gmatch(w, cp)) {
DBGPRINTF3(("FIND1CASE: returning &t1->left= %p.\n",
@@ -2469,13 +2461,13 @@ static int execute(struct op *t, int *pin, int *pout, int no_fork)
return 0;
}
- DBGPRINTF(("EXECUTE: t=%p, t->type=%d (%s), t->words is %s\n", t,
+ DBGPRINTF(("EXECUTE: t=%p, t->type=%d (%s), t->op_words is %s\n", t,
t->type, T_CMD_NAMES[t->type],
- ((t->words == NULL) ? "NULL" : t->words[0])));
+ ((t->op_words == NULL) ? "NULL" : t->op_words[0])));
rv = 0;
a = areanum++;
- wp2 = t->words;
+ wp2 = t->op_words;
wp = (wp2 != NULL)
? eval(wp2, t->type == TCOM ? DOALL : DOALL & ~DOKEY)
: NULL;
@@ -2486,7 +2478,7 @@ static int execute(struct op *t, int *pin, int *pout, int no_fork)
outtree_save = outtree;
- newfile(evalstr(t->words[0], DOALL));
+ newfile(evalstr(t->op_words[0], DOALL));
t->left = dowholefile(TLIST, 0);
t->right = NULL;
@@ -2575,7 +2567,8 @@ static int execute(struct op *t, int *pin, int *pout, int no_fork)
i = 0;
} else {
i = -1;
- while (*wp++ != NULL);
+ while (*wp++ != NULL)
+ continue;
}
vp = lookup(t->str);
while (setjmp(bc.brkpt))
@@ -2648,7 +2641,9 @@ static int execute(struct op *t, int *pin, int *pout, int no_fork)
};
broken:
- t->words = wp2;
+// Restoring op_words is most likely not needed now: see comment in forkexec()
+// (also take a look at exec builtin (doexec) - it touches t->op_words)
+ t->op_words = wp2;
isbreak = 0;
freehere(areanum);
freearea(areanum);
@@ -2711,8 +2706,8 @@ static int forkexec(struct op *t, int *pin, int *pout, int no_fork, char **wp)
DBGPRINTF(("FORKEXEC: t=%p, pin %p, pout %p, no_fork %d\n", t, pin,
pout, no_fork));
- DBGPRINTF7(("FORKEXEC: t->words is %s\n",
- ((t->words == NULL) ? "NULL" : t->words[0])));
+ DBGPRINTF7(("FORKEXEC: t->op_words is %s\n",
+ ((t->op_words == NULL) ? "NULL" : t->op_words[0])));
owp = wp;
resetsig = 0;
if (t->type == TCOM) {
@@ -2742,12 +2737,12 @@ static int forkexec(struct op *t, int *pin, int *pout, int no_fork, char **wp)
}
forked = 0;
- // We were pointing t->words to temporary (expanded) arg list:
- // t->words = wp;
+ // We were pointing t->op_words to temporary (expanded) arg list:
+ // t->op_words = wp;
// and restored it later (in execute()), but "break"
- // longjmps away (at "Run builtin" below), leaving t->words clobbered!
+ // longjmps away (at "Run builtin" below), leaving t->op_words clobbered!
// See http://bugs.busybox.net/view.php?id=846.
- // Now we do not touch t->words, but separately pass wp as param list
+ // Now we do not touch t->op_words, but separately pass wp as param list
// to builtins
DBGPRINTF(("FORKEXEC: bltin %p, no_fork %d, owp %p\n", bltin,
no_fork, owp));
@@ -3050,7 +3045,6 @@ static int setstatus(int s)
*/
static const char *rexecve(char *c, char **v, char **envp)
{
- int i;
const char *sp;
char *tp;
int asis = 0;
@@ -3081,7 +3075,9 @@ static const char *rexecve(char *c, char **v, char **envp)
}
if (tp != global_env.linep)
*tp++ = '/';
- for (i = 0; (*tp++ = c[i++]) != '\0';);
+ strcpy(tp, c);
+ //for (i = 0; (*tp++ = c[i++]) != '\0';)
+ // continue;
DBGPRINTF3(("REXECVE: global_env.linep is %s\n", global_env.linep));
@@ -3090,11 +3086,12 @@ static const char *rexecve(char *c, char **v, char **envp)
switch (errno) {
case ENOEXEC:
*v = global_env.linep;
- tp = *--v;
+ v--;
+ tp = *v;
*v = global_env.linep;
execve(DEFAULT_SHELL, v, envp);
*v = tp;
- return "no Shell";
+ return "no shell";
case ENOMEM:
return (char *) bb_msg_memory_exhausted;
@@ -3295,14 +3292,14 @@ static int doexec(struct op *t, char **args)
ofail = failpt;
failpt = ex;
- sv_words = t->words;
- t->words = args + 1;
+ sv_words = t->op_words;
+ t->op_words = args + 1;
// TODO: test what will happen with "exec break" -
-// will it leave t->words pointing to garbage?
+// will it leave t->op_words pointing to garbage?
// (see http://bugs.busybox.net/view.php?id=846)
if (setjmp(failpt) == 0)
execute(t, NOPIPE, NOPIPE, /* no_fork: */ 1);
- t->words = sv_words;
+ t->op_words = sv_words;
failpt = ofail;
execflg = 0;
@@ -3340,8 +3337,7 @@ static int dodot(struct op *t, char **args)
tp++;
if (tp != global_env.linep)
*tp++ = '/';
-
- for (i = 0; (*tp++ = cp[i++]) != '\0';);
+ strcpy(tp, cp);
/* Original code */
i = open(global_env.linep, O_RDONLY);
@@ -3566,7 +3562,8 @@ static void rdexp(char **wp, void (*f) (struct var *), int key)
char *cp;
assign(*wp, COPYV);
- for (cp = *wp; *cp != '='; cp++);
+ for (cp = *wp; *cp != '='; cp++)
+ continue;
*cp = '\0';
}
if (checkname(*wp))
@@ -4173,7 +4170,8 @@ static int grave(int quoted)
if (openpipe(pf) < 0)
return 0;
- while ((i = vfork()) == -1 && errno == EAGAIN);
+ while ((i = vfork()) == -1 && errno == EAGAIN)
+ continue;
DBGPRINTF3(("GRAVE: i is %p\n", io));
@@ -4273,7 +4271,7 @@ static struct wdblock *glob(char *cp, struct wdblock *wb)
}
for (i = 0; i < cl->w_nword; i++)
unquote(cl->w_words[i]);
- glob0((char *) cl->w_words, cl->w_nword, sizeof(char *), xstrcmp);
+ glob0((char *) cl->w_words, cl->w_nword /*, sizeof(char *), xstrcmp*/);
if (cl->w_nword) {
for (i = 0; i < cl->w_nword; i++)
wb = addword(cl->w_words[i], wb);
@@ -4298,11 +4296,11 @@ static void globname(char *we, char *pp)
for (np = we; np != pp; pp--)
if (pp[-1] == '/')
break;
- for (dp = cp = space((int) (pp - np) + 3); np < pp;)
+ for (dp = cp = get_space((int) (pp - np) + 3); np < pp;)
*cp++ = *np++;
*cp++ = '.';
*cp = '\0';
- for (gp = cp = space(strlen(pp) + 1); *np && *np != '/';)
+ for (gp = cp = get_space(strlen(pp) + 1); *np && *np != '/';)
*cp++ = *np++;
*cp = '\0';
dirp = opendir(dp);
@@ -4351,12 +4349,14 @@ static char *generate(char *start1, char *end1, char *middle, char *end)
char *p;
char *op, *xp;
- p = op = space((int)(end1 - start1) + strlen(middle) + strlen(end) + 2);
- for (xp = start1; xp != end1;)
+ p = op = get_space((int)(end1 - start1) + strlen(middle) + strlen(end) + 2);
+ xp = start1;
+ while (xp != end1)
+ *op++ = *xp++;
+ xp = middle;
+ while (*xp != '\0')
*op++ = *xp++;
- for (xp = middle; (*op++ = *xp++) != '\0';);
- op--;
- for (xp = end; (*op++ = *xp++) != '\0';);
+ strcpy(op, end);
return p;
}
@@ -4384,7 +4384,7 @@ static struct wdblock *newword(int nw)
{
struct wdblock *wb;
- wb = (struct wdblock *) space(sizeof(*wb) + nw * sizeof(char *));
+ wb = get_space(sizeof(*wb) + nw * sizeof(char *));
wb->w_bsize = nw;
wb->w_nword = 0;
return wb;
@@ -4421,43 +4421,34 @@ static char **getwords(struct wdblock *wb)
DELETE(wb);
return NULL;
}
- wd = (char **) space(nb = sizeof(*wd) * wb->w_nword);
+ nb = sizeof(*wd) * wb->w_nword;
+ wd = get_space(nb);
memcpy((char *) wd, (char *) wb->w_words, nb);
DELETE(wb); /* perhaps should done by caller */
return wd;
}
-static int (*func) (char *, char *);
-static int globv;
+/*static int (*cmp_func) (char *, char *);*/
+/*static int glob_item_sz;*/
+#define cmp_func xstrcmp
+enum { glob_item_sz = sizeof(char *) };
-static void glob3(char *i, char *j, char *k)
+static void glob3(char *index1, char *index2, char *index3)
{
- char *index1, *index2, *index3;
- int c;
- int m;
-
- m = globv;
- index1 = i;
- index2 = j;
- index3 = k;
+ int m = glob_item_sz;
do {
- c = *index1;
+ char c = *index1;
*index1++ = *index3;
*index3++ = *index2;
*index2++ = c;
} while (--m);
}
-static void glob2(char *i, char *j)
+static void glob2(char *index1, char *index2)
{
- char *index1, *index2, c;
- int m;
-
- m = globv;
- index1 = i;
- index2 = j;
+ int m = glob_item_sz;
do {
- c = *index1;
+ char c = *index1;
*index1++ = *index2;
*index2++ = c;
} while (--m);
@@ -4471,8 +4462,7 @@ static void glob1(char *base, char *lim)
int c;
unsigned n;
- v2 = globv;
-
+ v2 = glob_item_sz;
top:
n = (int) (lim - base);
if (n <= v2)
@@ -4483,7 +4473,7 @@ static void glob1(char *base, char *lim)
j = lim - v2;
for (;;) {
if (i < lptr) {
- c = (*func) (i, lptr);
+ c = cmp_func(i, lptr);
if (c == 0) {
lptr -= v2;
glob2(i, lptr);
@@ -4494,10 +4484,9 @@ static void glob1(char *base, char *lim)
continue;
}
}
-
begin:
if (j > hptr) {
- c = (*func) (hptr, j);
+ c = cmp_func(hptr, j);
if (c == 0) {
hptr += v2;
glob2(hptr, j);
@@ -4507,7 +4496,8 @@ static void glob1(char *base, char *lim)
if (i == lptr) {
hptr += v2;
glob3(i, hptr, j);
- i = (lptr += v2);
+ lptr += v2;
+ i = lptr;
goto begin;
}
glob2(i, j);
@@ -4519,7 +4509,6 @@ static void glob1(char *base, char *lim)
goto begin;
}
-
if (i == lptr) {
if (lptr - base >= lim - hptr) {
glob1(hptr + v2, lim);
@@ -4533,15 +4522,17 @@ static void glob1(char *base, char *lim)
lptr -= v2;
glob3(j, lptr, i);
- j = (hptr -= v2);
+ hptr -= v2;
+ j = hptr;
}
}
-static void glob0(char *a0, unsigned a1, int a2, int (*a3) (char *, char *))
+static void glob0(char *a0, unsigned a1
+ /*, int item_sz, int (*f) (char *, char *) */)
{
- func = a3;
- globv = a2;
- glob1(a0, a0 + a1 * a2);
+ /*cmp_func = f; - always xstrcmp */
+ /*glob_item_sz = item_sz; - always sizeof(char*) */
+ glob1(a0, a0 + a1 * /*item_sz:*/ sizeof(char*));
}
@@ -4556,7 +4547,8 @@ static int my_getc(int ec)
int c;
if (global_env.linep > elinep) {
- while ((c = readc()) != '\n' && c);
+ while ((c = readc()) != '\n' && c)
+ continue;
err("input line too long");
gflg = 1;
return c;
@@ -5003,7 +4995,7 @@ static void markhere(char *s, struct ioword *iop)
DBGPRINTF7(("MARKHERE: enter, s=%p\n", s));
- h = (struct here *) space(sizeof(struct here));
+ h = get_space(sizeof(struct here));
if (h == NULL)
return;