diff options
Diffstat (limited to 'shell/ash.c')
| -rw-r--r-- | shell/ash.c | 38 |
1 files changed, 26 insertions, 12 deletions
diff --git a/shell/ash.c b/shell/ash.c index 6ef0a7ac2..4641dfd19 100644 --- a/shell/ash.c +++ b/shell/ash.c @@ -5902,7 +5902,7 @@ static int substr_atoi(const char *s) #define EXP_CASE 0x10 /* keeps quotes around for CASE pattern */ #define EXP_VARTILDE2 0x20 /* expand tildes after colons only */ #define EXP_WORD 0x40 /* expand word in parameter expansion */ -#define EXP_QUOTED 0x80 /* expand word in double quotes */ +#define EXP_QUOTED 0x100 /* expand word in double quotes */ /* * rmescape() flags */ @@ -7175,14 +7175,13 @@ subevalvar(char *p, char *varname, int strloc, int subtype, * ash -c 'echo ${#1#}' name:'1=#' */ static NOINLINE ssize_t -varvalue(char *name, int varflags, int flags, int *quotedp) +varvalue(char *name, int varflags, int flags, int quoted) { const char *p; int num; int i; ssize_t len = 0; int sep; - int quoted = *quotedp; int subtype = varflags & VSTYPE; int discard = subtype == VSPLUS || subtype == VSLENGTH; int quotes = (discard ? 0 : (flags & QUOTES_ESC)) | QUOTES_KEEPNUL; @@ -7230,13 +7229,27 @@ varvalue(char *name, int varflags, int flags, int *quotedp) case '*': { char **ap; char sepc; + char c; - if (quoted) - sep = 0; - sep |= ifsset() ? ifsval()[0] : ' '; + /* We will set c to 0 or ~0 depending on whether + * we're doing field splitting. We won't do field + * splitting if either we're quoted or sep is zero. + * + * Instead of testing (quoted || !sep) the following + * trick optimises away any branches by using the + * fact that EXP_QUOTED (which is the only bit that + * can be set in quoted) is the same as EXP_FULL << + * CHAR_BIT (which is the only bit that can be set + * in sep). + */ +#if EXP_QUOTED >> CHAR_BIT != EXP_FULL +#error The following two lines expect EXP_QUOTED == EXP_FULL << CHAR_BIT +#endif + c = !((quoted | ~sep) & EXP_QUOTED) - 1; + sep &= ~quoted; + sep |= ifsset() ? (unsigned char)(c & ifsval()[0]) : ' '; param: sepc = sep; - *quotedp = !sepc; ap = shellparam.p; if (!ap) return -1; @@ -7301,7 +7314,6 @@ evalvar(char *p, int flag) char varflags; char subtype; int quoted; - char easy; char *var; int patloc; int startloc; @@ -7315,12 +7327,11 @@ evalvar(char *p, int flag) quoted = flag & EXP_QUOTED; var = p; - easy = (!quoted || (*var == '@' && shellparam.nparam)); startloc = expdest - (char *)stackblock(); p = strchr(p, '=') + 1; //TODO: use var_end(p)? again: - varlen = varvalue(var, varflags, flag, "ed); + varlen = varvalue(var, varflags, flag, quoted); if (varflags & VSNUL) varlen--; @@ -7366,8 +7377,11 @@ evalvar(char *p, int flag) if (subtype == VSNORMAL) { record: - if (!easy) - goto end; + if (quoted) { + quoted = *var == '@' && shellparam.nparam; + if (!quoted) + goto end; + } recordregion(startloc, expdest - (char *)stackblock(), quoted); goto end; } |