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ash: remove one redundant function, improve string sharing, better field names
function old new delta var_end - 15 +15 changepath 194 192 -2 setvareq 222 218 -4 lookupvar 57 51 -6 bltinlookup 57 51 -6 evalfun 452 443 -9 varequal 14 - -14 ------------------------------------------------------------------------------ (add/remove: 1/1 grow/shrink: 0/5 up/down: 15/-41) Total: -26 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
parent
8376bfae58
commit
8837c5dec4
112
shell/ash.c
112
shell/ash.c
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@ -279,6 +279,14 @@ static int isdigit_str9(const char *str)
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return (*str == '\0');
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}
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static const char *var_end(const char *var)
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{
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while (*var)
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if (*var++ == '=')
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break;
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return var;
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}
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/* ============ Interrupts / exceptions */
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/*
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@ -1712,8 +1720,8 @@ static void FAST_FUNC getoptsreset(const char *value);
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struct var {
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struct var *next; /* next entry in hash list */
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int flags; /* flags are defined above */
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const char *text; /* name=value */
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void (*func)(const char *) FAST_FUNC; /* function to be called when */
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const char *var_text; /* name=value */
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void (*var_func)(const char *) FAST_FUNC; /* function to be called when */
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/* the variable gets set/unset */
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};
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@ -1767,13 +1775,13 @@ static void change_random(const char *) FAST_FUNC;
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static const struct {
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int flags;
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const char *text;
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void (*func)(const char *) FAST_FUNC;
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const char *var_text;
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void (*var_func)(const char *) FAST_FUNC;
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} varinit_data[] = {
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{ VSTRFIXED|VTEXTFIXED , defifsvar , NULL },
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#if ENABLE_ASH_MAIL
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{ VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL\0" , changemail },
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{ VSTRFIXED|VTEXTFIXED|VUNSET, "MAILPATH\0", changemail },
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{ VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL" , changemail },
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{ VSTRFIXED|VTEXTFIXED|VUNSET, "MAILPATH" , changemail },
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#endif
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{ VSTRFIXED|VTEXTFIXED , bb_PATH_root_path, changepath },
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{ VSTRFIXED|VTEXTFIXED , "PS1=$ " , NULL },
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@ -1783,14 +1791,14 @@ static const struct {
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{ VSTRFIXED|VTEXTFIXED , "OPTIND=1" , getoptsreset },
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#endif
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#if ENABLE_ASH_RANDOM_SUPPORT
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{ VSTRFIXED|VTEXTFIXED|VUNSET|VDYNAMIC, "RANDOM\0", change_random },
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{ VSTRFIXED|VTEXTFIXED|VUNSET|VDYNAMIC, "RANDOM", change_random },
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#endif
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#if ENABLE_LOCALE_SUPPORT
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{ VSTRFIXED|VTEXTFIXED|VUNSET, "LC_ALL\0" , change_lc_all },
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{ VSTRFIXED|VTEXTFIXED|VUNSET, "LC_CTYPE\0", change_lc_ctype },
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{ VSTRFIXED|VTEXTFIXED|VUNSET, "LC_ALL" , change_lc_all },
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{ VSTRFIXED|VTEXTFIXED|VUNSET, "LC_CTYPE" , change_lc_ctype },
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#endif
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#if ENABLE_FEATURE_EDITING_SAVEHISTORY
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{ VSTRFIXED|VTEXTFIXED|VUNSET, "HISTFILE\0", NULL },
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{ VSTRFIXED|VTEXTFIXED|VUNSET, "HISTFILE" , NULL },
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#endif
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};
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@ -1817,9 +1825,9 @@ extern struct globals_var *const ash_ptr_to_globals_var;
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(*(struct globals_var**)&ash_ptr_to_globals_var) = xzalloc(sizeof(G_var)); \
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barrier(); \
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for (i = 0; i < ARRAY_SIZE(varinit_data); i++) { \
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varinit[i].flags = varinit_data[i].flags; \
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varinit[i].text = varinit_data[i].text; \
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varinit[i].func = varinit_data[i].func; \
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varinit[i].flags = varinit_data[i].flags; \
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varinit[i].var_text = varinit_data[i].var_text; \
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varinit[i].var_func = varinit_data[i].var_func; \
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} \
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} while (0)
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@ -1850,19 +1858,19 @@ extern struct globals_var *const ash_ptr_to_globals_var;
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* They have to skip over the name. They return the null string
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* for unset variables.
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*/
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#define ifsval() (vifs.text + 4)
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#define ifsval() (vifs.var_text + 4)
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#define ifsset() ((vifs.flags & VUNSET) == 0)
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#if ENABLE_ASH_MAIL
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# define mailval() (vmail.text + 5)
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# define mpathval() (vmpath.text + 9)
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# define mailval() (vmail.var_text + 5)
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# define mpathval() (vmpath.var_text + 9)
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# define mpathset() ((vmpath.flags & VUNSET) == 0)
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#endif
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#define pathval() (vpath.text + 5)
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#define ps1val() (vps1.text + 4)
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#define ps2val() (vps2.text + 4)
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#define ps4val() (vps4.text + 4)
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#define pathval() (vpath.var_text + 5)
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#define ps1val() (vps1.var_text + 4)
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#define ps2val() (vps2.var_text + 4)
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#define ps4val() (vps4.var_text + 4)
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#if ENABLE_ASH_GETOPTS
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# define optindval() (voptind.text + 7)
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# define optindval() (voptind.var_text + 7)
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#endif
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@ -1921,12 +1929,6 @@ varcmp(const char *p, const char *q)
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return c - d;
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}
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static int
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varequal(const char *a, const char *b)
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{
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return !varcmp(a, b);
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}
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/*
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* Find the appropriate entry in the hash table from the name.
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*/
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@ -1961,15 +1963,15 @@ initvar(void)
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* PS1 depends on uid
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*/
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#if ENABLE_FEATURE_EDITING && ENABLE_FEATURE_EDITING_FANCY_PROMPT
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vps1.text = "PS1=\\w \\$ ";
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vps1.var_text = "PS1=\\w \\$ ";
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#else
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if (!geteuid())
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vps1.text = "PS1=# ";
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vps1.var_text = "PS1=# ";
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#endif
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vp = varinit;
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end = vp + ARRAY_SIZE(varinit);
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do {
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vpp = hashvar(vp->text);
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vpp = hashvar(vp->var_text);
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vp->next = *vpp;
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*vpp = vp;
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} while (++vp < end);
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@ -1979,7 +1981,7 @@ static struct var **
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findvar(struct var **vpp, const char *name)
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{
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for (; *vpp; vpp = &(*vpp)->next) {
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if (varequal((*vpp)->text, name)) {
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if (varcmp((*vpp)->var_text, name) == 0) {
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break;
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}
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}
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@ -2003,11 +2005,11 @@ lookupvar(const char *name)
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* As soon as they're unset, they're no longer dynamic, and dynamic
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* lookup will no longer happen at that point. -- PFM.
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*/
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if ((v->flags & VDYNAMIC))
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(*v->func)(NULL);
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if (v->flags & VDYNAMIC)
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v->var_func(NULL);
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#endif
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if (!(v->flags & VUNSET))
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return strchrnul(v->text, '=') + 1;
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return var_end(v->var_text);
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}
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return NULL;
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}
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@ -2021,8 +2023,8 @@ bltinlookup(const char *name)
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struct strlist *sp;
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for (sp = cmdenviron; sp; sp = sp->next) {
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if (varequal(sp->text, name))
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return strchrnul(sp->text, '=') + 1;
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if (varcmp(sp->text, name) == 0)
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return var_end(sp->text);
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}
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return lookupvar(name);
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}
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@ -2048,24 +2050,24 @@ setvareq(char *s, int flags)
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if (flags & VNOSAVE)
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free(s);
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n = vp->text;
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n = vp->var_text;
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ash_msg_and_raise_error("%.*s: is read only", strchrnul(n, '=') - n, n);
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}
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if (flags & VNOSET)
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return;
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if (vp->func && (flags & VNOFUNC) == 0)
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(*vp->func)(strchrnul(s, '=') + 1);
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if (vp->var_func && !(flags & VNOFUNC))
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vp->var_func(var_end(s));
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if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
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free((char*)vp->text);
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if (!(vp->flags & (VTEXTFIXED|VSTACK)))
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free((char*)vp->var_text);
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flags |= vp->flags & ~(VTEXTFIXED|VSTACK|VNOSAVE|VUNSET);
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} else {
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/* variable s is not found */
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if (flags & VNOSET)
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return;
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/* not found */
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vp = ckzalloc(sizeof(*vp));
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vp->next = *vpp;
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/*vp->func = NULL; - ckzalloc did it */
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@ -2073,7 +2075,7 @@ setvareq(char *s, int flags)
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}
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if (!(flags & (VTEXTFIXED|VSTACK|VNOSAVE)))
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s = ckstrdup(s);
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vp->text = s;
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vp->var_text = s;
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vp->flags = flags;
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}
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@ -2171,7 +2173,7 @@ unsetvar(const char *s)
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if ((flags & VSTRFIXED) == 0) {
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INT_OFF;
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if ((flags & (VTEXTFIXED|VSTACK)) == 0)
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free((char*)vp->text);
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free((char*)vp->var_text);
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*vpp = vp->next;
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free(vp);
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INT_ON;
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@ -2223,7 +2225,7 @@ listvars(int on, int off, char ***end)
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if ((vp->flags & mask) == on) {
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if (ep == stackstrend())
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ep = growstackstr();
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*ep++ = (char *) vp->text;
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*ep++ = (char*)vp->var_text;
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}
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}
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} while (++vpp < vartab + VTABSIZE);
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@ -6591,7 +6593,7 @@ evalvar(char *p, int flags, struct strlist *var_str_list)
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var = p;
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easy = (!quoted || (*var == '@' && shellparam.nparam));
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startloc = expdest - (char *)stackblock();
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p = strchr(p, '=') + 1;
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p = strchr(p, '=') + 1; //TODO: use var_end(p)?
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again:
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varlen = varvalue(var, varflags, flags, var_str_list);
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@ -8637,14 +8639,14 @@ poplocalvars(void)
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free((char*)lvp->text);
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optschanged();
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} else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) {
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unsetvar(vp->text);
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unsetvar(vp->var_text);
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} else {
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if (vp->func)
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(*vp->func)(strchrnul(lvp->text, '=') + 1);
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if (vp->var_func)
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vp->var_func(var_end(lvp->text));
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if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
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free((char*)vp->text);
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free((char*)vp->var_text);
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vp->flags = lvp->flags;
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vp->text = lvp->text;
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vp->var_text = lvp->text;
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}
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free(lvp);
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}
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@ -8763,7 +8765,7 @@ mklocal(char *name)
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vp = *vpp; /* the new variable */
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lvp->flags = VUNSET;
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} else {
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lvp->text = vp->text;
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lvp->text = vp->var_text;
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lvp->flags = vp->flags;
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vp->flags |= VSTRFIXED|VTEXTFIXED;
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if (eq)
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@ -9073,7 +9075,7 @@ evalcommand(union node *cmd, int flags)
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expredir(cmd->ncmd.redirect);
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status = redirectsafe(cmd->ncmd.redirect, REDIR_PUSH | REDIR_SAVEFD2);
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path = vpath.text;
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path = vpath.var_text;
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for (argp = cmd->ncmd.assign; argp; argp = argp->narg.next) {
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struct strlist **spp;
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char *p;
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@ -9086,7 +9088,7 @@ evalcommand(union node *cmd, int flags)
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* is present
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*/
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p = (*spp)->text;
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if (varequal(p, path))
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if (varcmp(p, path) == 0)
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path = p;
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}
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@ -10113,7 +10115,7 @@ change_random(const char *value)
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/* "get", generate */
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t = next_random(&random_gen);
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/* set without recursion */
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setvar(vrandom.text, utoa(t), VNOFUNC);
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setvar(vrandom.var_text, utoa(t), VNOFUNC);
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vrandom.flags &= ~VNOFUNC;
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} else {
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/* set/reset */
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