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msh: shrink, mainly by using smallints
function old new delta synio 251 263 +12 filechar 310 315 +5 subgetc 781 785 +4 brkcontin 106 109 +3 ... yylex 981 976 -5 execute 2513 2508 -5 waitfor 321 315 -6 onintr 103 97 -6 doset 332 326 -6 doexec 186 180 -6 yyparse 65 57 -8 thenpart 135 126 -9 forkexec 1379 1370 -9 onecommand 457 433 -24 newtp 52 28 -24 command 1086 1061 -25 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 7/23 up/down: 27/-163) Total: -136 bytes
This commit is contained in:
Denis Vlasenko
parent
a5f2cd30c9
commit
648b44fd78
118
shell/msh.c
118
shell/msh.c
@ -158,7 +158,7 @@ int mshdbg_rc = 0;
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/*
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* library and system definitions
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*/
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typedef void xint; /* base type of jmp_buf, for not broken compilers */
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typedef void xint; /* base type of jmp_buf, for not broken compilers */
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/*
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* shell components
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@ -172,20 +172,20 @@ typedef void xint; /* base type of jmp_buf, for not broken compilers */
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* redirection
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*/
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struct ioword {
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short io_unit; /* unit affected */
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short io_flag; /* action (below) */
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char *io_name; /* file name */
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short io_unit; /* unit affected */
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short io_flag; /* action (below) */
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char *io_name; /* file name */
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};
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#define IOREAD 1 /* < */
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#define IOHERE 2 /* << (here file) */
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#define IOWRITE 4 /* > */
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#define IOCAT 8 /* >> */
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#define IOXHERE 16 /* ${}, ` in << */
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#define IODUP 32 /* >&digit */
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#define IOCLOSE 64 /* >&- */
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#define IOREAD 1 /* < */
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#define IOHERE 2 /* << (here file) */
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#define IOWRITE 4 /* > */
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#define IOCAT 8 /* >> */
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#define IOXHERE 16 /* ${}, ` in << */
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#define IODUP 32 /* >&digit */
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#define IOCLOSE 64 /* >&- */
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#define IODEFAULT (-1) /* token for default IO unit */
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#define IODEFAULT (-1) /* token for default IO unit */
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/*
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@ -193,12 +193,12 @@ struct ioword {
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* Might eventually use a union.
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*/
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struct op {
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int type; /* operation type, see below */
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char **words; /* arguments to a command */
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struct ioword **ioact; /* IO actions (eg, < > >>) */
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smallint type; /* operation type, see Txxxx below */
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char **words; /* arguments to a command */
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struct ioword **ioact; /* IO actions (eg, < > >>) */
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struct op *left;
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struct op *right;
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char *str; /* identifier for case and for */
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char *str; /* identifier for case and for */
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};
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#define TCOM 1 /* command */
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@ -269,9 +269,9 @@ struct brkcon {
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};
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static int trapset; /* trap pending */
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static smallint trapset; /* trap pending (signal number) */
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static int yynerrs; /* yacc */
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static smallint yynerrs; /* yacc (flag) */
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/* moved to G: static char line[LINELIM]; */
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@ -420,7 +420,7 @@ struct ioarg {
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char **awordlist;
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int afile; /* file descriptor */
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unsigned afid; /* buffer id */
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long afpos; /* file position */
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off_t afpos; /* file position */
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struct iobuf *afbuf; /* buffer for this file */
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};
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@ -539,7 +539,7 @@ static int xxchar(struct ioarg *ap);
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struct here {
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char *h_tag;
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int h_dosub;
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char h_dosub;
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struct ioword *h_iop;
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struct here *h_next;
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};
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@ -600,15 +600,15 @@ static struct op *dowholefile(int, int);
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static char **dolv;
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static int dolc;
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static int exstat;
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static char gflg;
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static int interactive; /* Is this an interactive shell */
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static int execflg;
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static int multiline; /* \n changed to ; */
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static struct op *outtree; /* result from parser */
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static smallint gflg; /* (seems to be a parse error indicator) */
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static smallint interactive; /* Is this an interactive shell */
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static smallint execflg;
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static smallint isbreak; /* "break" statement was seen */
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static int multiline; /* '\n' changed to ';' (counter) */
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static struct op *outtree; /* result from parser */
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static xint *failpt;
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static xint *errpt;
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static struct brkcon *brklist;
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static int isbreak;
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static struct wdblock *wdlist;
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static struct wdblock *iolist;
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@ -624,10 +624,10 @@ static struct var *shell; /* shell to interpret command files */
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static struct var *ifs; /* field separators */
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static int areanum; /* current allocation area */
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static int intr; /* interrupt pending */
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static smallint intr; /* interrupt pending (bool) */
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static smallint heedint = 1; /* heed interrupt signals (bool) */
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static int inparse;
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static char *null = (char*)""; /* null value for variable */
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static int heedint = 1; /* heed interrupt signals */
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static void (*qflag)(int) = SIG_IGN;
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static int startl;
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static int peeksym;
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@ -1560,10 +1560,11 @@ static int gmatch(const char *s, const char *p)
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static void yyerror(const char *s) ATTRIBUTE_NORETURN;
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static void yyerror(const char *s)
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{
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yynerrs++;
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yynerrs = 1;
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if (interactive && global_env.iop <= iostack) {
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multiline = 0;
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while (eofc() == 0 && yylex(0) != '\n');
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while (eofc() == 0 && yylex(0) != '\n')
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continue;
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}
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err(s);
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fail();
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@ -1584,7 +1585,7 @@ int yyparse(void)
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yynerrs = 0;
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outtree = c_list();
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musthave('\n', 0);
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return (yynerrs != 0);
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return yynerrs; /* 0/1 */
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}
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static struct op *pipeline(int cf)
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@ -1819,7 +1820,7 @@ static struct op *command(int cf)
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case UNTIL:
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multiline++;
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t = newtp();
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t->type = c == WHILE ? TWHILE : TUNTIL;
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t->type = (c == WHILE ? TWHILE : TUNTIL);
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t->left = c_list();
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t->right = dogroup(1);
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t->words = NULL;
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@ -1916,7 +1917,7 @@ static struct op *thenpart(void)
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return NULL;
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}
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t = newtp();
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t->type = 0;
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/*t->type = 0; - newtp() did this */
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t->left = c_list();
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if (t->left == NULL)
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zzerr();
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@ -2044,8 +2045,7 @@ static struct op *block(int type, struct op *t1, struct op *t2, char **wp)
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t->right = t2;
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t->words = wp;
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DBGPRINTF7(("BLOCK: inserted %p between %p and %p\n", t, t1,
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t2));
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DBGPRINTF7(("BLOCK: inserted %p between %p and %p\n", t, t1, t2));
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return t;
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}
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@ -2099,12 +2099,7 @@ static struct op *newtp(void)
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struct op *t;
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t = (struct op *) tree(sizeof(*t));
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t->type = 0;
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t->words = NULL;
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t->ioact = NULL;
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t->left = NULL;
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t->right = NULL;
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t->str = NULL;
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memset(t, 0, sizeof(*t));
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DBGPRINTF3(("NEWTP: allocated %p\n", t));
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@ -2481,7 +2476,8 @@ static int execute(struct op *t, int *pin, int *pout, int act)
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rv = 0;
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a = areanum++;
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wp = (wp2 = t->words) != NULL
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wp2 = t->words;
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wp = (wp2 != NULL)
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? eval(wp2, t->type == TCOM ? DOALL : DOALL & ~DOKEY)
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: NULL;
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@ -2533,7 +2529,7 @@ static int execute(struct op *t, int *pin, int *pout, int act)
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case TASYNC:
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{
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int hinteractive = interactive;
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smallint hinteractive = interactive;
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DBGPRINTF7(("EXECUTE: TASYNC clause, calling vfork()...\n"));
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@ -2700,10 +2696,10 @@ static int forkexec(struct op *t, int *pin, int *pout, int act, char **wp)
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int *hpin = pin;
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int *hpout = pout;
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char *hwp;
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int hinteractive;
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int hintr;
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smallint hinteractive;
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smallint hintr;
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smallint hexecflg;
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struct brkcon *hbrklist;
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int hexecflg;
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#if __GNUC__
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/* Avoid longjmp clobbering */
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@ -2993,7 +2989,7 @@ static int waitfor(int lastpid, int canintr)
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{
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int pid, rv;
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int s;
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int oheedint = heedint;
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smallint oheedint = heedint;
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heedint = 0;
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rv = 0;
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@ -3521,7 +3517,7 @@ static int brkcontin(char *cp, int val)
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err("bad break/continue level");
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return 1;
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}
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isbreak = val;
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isbreak = (val != 0);
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longjmp(bc->brkpt, 1);
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/* NOTREACHED */
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}
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@ -3699,7 +3695,7 @@ static char **eval(char **ap, int f)
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expand(*wf, &wb, f & ~DOGLOB);
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}
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}
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for (wb = addword((char *) 0, wb); *ap; ap++) {
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for (wb = addword((char *) NULL, wb); *ap; ap++) {
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if (!FLAG['k'] || !isassign(*ap))
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expand(*ap, &wb, f & ~DOKEY);
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}
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@ -3935,13 +3931,13 @@ static int dollar(int quoted)
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global_env.iop->task = otask;
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if (c != '}') {
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err("unclosed ${");
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gflg++;
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gflg = 1;
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return c;
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}
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}
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if (global_env.linep >= elinep) {
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err("string in ${} too long");
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gflg++;
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gflg = 1;
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global_env.linep -= 10;
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}
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*global_env.linep = 0;
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@ -3971,7 +3967,7 @@ static int dollar(int quoted)
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case '=':
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if (isdigit(*s)) {
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err("cannot use ${...=...} with $n");
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gflg++;
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gflg = 1;
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break;
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}
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setval(vp, cp);
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@ -3988,7 +3984,7 @@ static int dollar(int quoted)
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err(s);
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} else
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err(cp);
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gflg++;
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gflg = 1;
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break;
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}
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} else if (c == '+')
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@ -3996,7 +3992,7 @@ static int dollar(int quoted)
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if (FLAG['u'] && dolp == null) {
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prs("unset variable: ");
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err(s);
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gflg++;
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gflg = 1;
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}
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global_env.linep = s;
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PUSHIO(aword, dolp, quoted ? qstrchar : strchar);
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@ -4539,7 +4535,7 @@ static int my_getc(int ec)
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if (global_env.linep > elinep) {
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while ((c = readc()) != '\n' && c);
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err("input line too long");
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gflg++;
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gflg = 1;
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return c;
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}
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c = readc();
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@ -4638,7 +4634,7 @@ static void pushio(struct ioarg *argp, int (*fn) (struct ioarg *))
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if (++global_env.iop >= &iostack[NPUSH]) {
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global_env.iop--;
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err("Shell input nested too deeply");
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gflg++;
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gflg = 1;
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return;
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}
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@ -5012,7 +5008,7 @@ static void markhere(char *s, struct ioword *iop)
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*s &= ~QUOTE;
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}
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}
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h->h_dosub = iop->io_flag & IOXHERE;
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h->h_dosub = ((iop->io_flag & IOXHERE) ? '\0' : '\'');
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}
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static void gethere(void)
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@ -5023,7 +5019,7 @@ static void gethere(void)
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/* Scan here files first leaving inhere list in place */
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for (hp = h = inhere; h != NULL; hp = h, h = h->h_next)
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readhere(&h->h_iop->io_name, h->h_tag, h->h_dosub ? 0 : '\'');
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readhere(&h->h_iop->io_name, h->h_tag, h->h_dosub /* NUL or ' */);
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/* Make inhere list active - keep list intact for scraphere */
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if (hp != NULL) {
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@ -5288,7 +5284,7 @@ int msh_main(int argc, char **argv)
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break;
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case 'i':
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interactive++;
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interactive = 1;
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default:
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if (*s >= 'a' && *s <= 'z')
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FLAG[(int) *s]++;
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@ -5324,7 +5320,7 @@ int msh_main(int argc, char **argv)
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if (global_env.iop < iostack) {
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PUSHIO(afile, 0, iof);
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if (isatty(0) && isatty(1) && !cflag) {
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interactive++;
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interactive = 1;
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#if !ENABLE_FEATURE_SH_EXTRA_QUIET
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#ifdef MSHDEBUG
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printf("\n\n%s built-in shell (msh with debug)\n", bb_banner);
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@ -5338,7 +5334,7 @@ int msh_main(int argc, char **argv)
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signal(SIGQUIT, qflag);
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if (name && name[0] == '-') {
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interactive++;
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interactive = 1;
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f = open(".profile", O_RDONLY);
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if (f >= 0)
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next(remap(f));
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