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sh: Don't scan word twice in ${param#%##%%word}.

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If word is expanded, use the found end instead of iterating over the data
again.
This commit is contained in:
Jilles Tjoelker 2017-04-02 13:29:27 +00:00
parent c422c270b5
commit e2708b1624
1 changed files with 12 additions and 11 deletions
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23
bin/sh/expand.c
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@ -96,7 +96,8 @@ static const char *exptilde(const char *, int);
static const char *expari(const char *, struct nodelist **restrict, int,
struct worddest *);
static void expbackq(union node *, int, int, struct worddest *);
static void subevalvar_trim(const char *, struct nodelist *, int, int, int);
static const char *subevalvar_trim(const char *, struct nodelist **restrict,
int, int, int);
static void subevalvar_misc(const char *, struct nodelist *, const char *, int,
int, int);
static const char *evalvar(const char *, struct nodelist **restrict, int,
@ -540,18 +541,17 @@ recordleft(const char *str, const char *loc, char *startp)
*startp++ = *loc++;
}
static void
subevalvar_trim(const char *p, struct nodelist *argbackq, int strloc,
static const char *
subevalvar_trim(const char *p, struct nodelist **restrict argbackq, int strloc,
int subtype, int startloc)
{
char *startp;
char *loc = NULL;
char *str;
int c = 0;
struct nodelist *argbackqcopy = argbackq;
int amount;
argstr(p, &argbackqcopy, EXP_CASE | EXP_TILDE, NULL);
p = argstr(p, argbackq, EXP_CASE | EXP_TILDE, NULL);
STACKSTRNUL(expdest);
startp = stackblock() + startloc;
str = stackblock() + strloc;
@ -564,7 +564,7 @@ subevalvar_trim(const char *p, struct nodelist *argbackq, int strloc,
if (patmatch(str, startp)) {
*loc = c;
recordleft(str, loc, startp);
return;
return p;
}
*loc = c;
}
@ -577,7 +577,7 @@ subevalvar_trim(const char *p, struct nodelist *argbackq, int strloc,
if (patmatch(str, startp)) {
*loc = c;
recordleft(str, loc, startp);
return;
return p;
}
*loc = c;
loc--;
@ -589,7 +589,7 @@ subevalvar_trim(const char *p, struct nodelist *argbackq, int strloc,
if (patmatch(str, loc)) {
amount = loc - expdest;
STADJUST(amount, expdest);
return;
return p;
}
loc--;
}
@ -600,7 +600,7 @@ subevalvar_trim(const char *p, struct nodelist *argbackq, int strloc,
if (patmatch(str, loc)) {
amount = loc - expdest;
STADJUST(amount, expdest);
return;
return p;
}
}
break;
@ -611,6 +611,7 @@ subevalvar_trim(const char *p, struct nodelist *argbackq, int strloc,
}
amount = (expdest - stackblock() - strloc) + 1;
STADJUST(-amount, expdest);
return p;
}
@ -776,11 +777,11 @@ evalvar(const char *p, struct nodelist **restrict argbackq, int flag,
*/
STPUTC('\0', expdest);
patloc = expdest - stackblock();
subevalvar_trim(p, *argbackq, patloc, subtype, startloc);
p = subevalvar_trim(p, argbackq, patloc, subtype, startloc);
reprocess(startloc, flag, VSNORMAL, varflags & VSQUOTE, dst);
if (flag & EXP_SPLIT && *var == '@' && varflags & VSQUOTE)
dst->state = WORD_QUOTEMARK;
break;
return p;
case VSASSIGN:
case VSQUESTION: