diff options
| -rw-r--r-- | shell/ash.c | 84 |
1 files changed, 38 insertions, 46 deletions
diff --git a/shell/ash.c b/shell/ash.c index 7af8842..a81922a 100644 --- a/shell/ash.c +++ b/shell/ash.c @@ -5539,6 +5539,11 @@ ash_arith(const char *s) #define RMESCAPE_GROW 0x8 /* Grow strings instead of stalloc */ #define RMESCAPE_HEAP 0x10 /* Malloc strings instead of stalloc */ +/* Add CTLESC when necessary. */ +#define QUOTES_ESC (EXP_FULL | EXP_CASE | EXP_REDIR) +/* Do not skip NUL characters. */ +#define QUOTES_KEEPNUL EXP_TILDE + /* * Structure specifying which parts of the string should be searched * for IFS characters. @@ -5695,29 +5700,34 @@ preglob(const char *pattern, int quoted, int flag) static void memtodest(const char *p, size_t len, int syntax, int quotes) { - char *q = expdest; + char *q; + + if (!len) + return; - q = makestrspace(quotes ? len * 2 : len, q); + q = makestrspace((quotes & QUOTES_ESC) ? len * 2 : len, expdest); - while (len--) { + do { unsigned char c = *p++; - if (c == '\0') - continue; - if (quotes) { + if (c) { int n = SIT(c, syntax); - if (n == CCTL || n == CBACK) + if ((quotes & QUOTES_ESC) && + (n == CCTL || n == CBACK)) USTPUTC(CTLESC, q); - } + } else if (!(quotes & QUOTES_KEEPNUL)) + continue; USTPUTC(c, q); - } + } while (--len); expdest = q; } -static void +static size_t strtodest(const char *p, int syntax, int quotes) { - memtodest(p, strlen(p), syntax, quotes); + size_t len = strlen(p); + memtodest(p, len, syntax, quotes); + return len; } /* @@ -5790,7 +5800,7 @@ exptilde(char *startp, char *p, int flags) char *name; struct passwd *pw; const char *home; - int quotes = flags & (EXP_FULL | EXP_CASE | EXP_REDIR); + int quotes = flags & QUOTES_ESC; name = p + 1; @@ -6043,7 +6053,7 @@ argstr(char *p, int flags, struct strlist *var_str_list) '\0' }; const char *reject = spclchars; - int quotes = flags & (EXP_FULL | EXP_CASE | EXP_REDIR); /* do CTLESC */ + int quotes = flags & QUOTES_ESC; int breakall = flags & EXP_WORD; int inquotes; size_t length; @@ -6608,13 +6618,16 @@ varvalue(char *name, int varflags, int flags, struct strlist *var_str_list) const char *p; int num; int i; - int sepq = 0; ssize_t len = 0; - int subtype = varflags & VSTYPE; - int quotes = flags & (EXP_FULL | EXP_CASE | EXP_REDIR); + int sep; int quoted = varflags & VSQUOTE; + int subtype = varflags & VSTYPE; + int discard = subtype == VSPLUS || subtype == VSLENGTH; + int quotes = (discard ? 0 : (flags & QUOTES_ESC)) | QUOTES_KEEPNUL; int syntax = quoted ? DQSYNTAX : BASESYNTAX; + sep = quoted ? ((flags & EXP_FULL) << CHAR_BIT) : 0; + switch (*name) { case '$': num = rootpid; @@ -6649,7 +6662,7 @@ varvalue(char *name, int varflags, int flags, struct strlist *var_str_list) break; case '@': { char **ap; - int sep; + char sepc; if (quoted && (flags & EXP_FULL)) { /* note: this is not meant as PEOF value */ @@ -6659,39 +6672,20 @@ varvalue(char *name, int varflags, int flags, struct strlist *var_str_list) /* fall through */ case '*': sep = ifsset() ? (unsigned char)(ifsval()[0]) : ' '; - i = SIT(sep, syntax); - if (quotes && (i == CCTL || i == CBACK)) - sepq = 1; param: ap = shellparam.p; + sepc = sep; if (!ap) return -1; while ((p = *ap++) != NULL) { - size_t partlen; - - partlen = strlen(p); - len += partlen; - - if (!(subtype == VSPLUS || subtype == VSLENGTH)) - memtodest(p, partlen, syntax, quotes); + len += strtodest(p, syntax, quotes); if (*ap && sep) { - char *q; - len++; - if (subtype == VSPLUS || subtype == VSLENGTH) { - continue; - } - q = expdest; - if (sepq) - STPUTC(CTLESC, q); - /* note: may put NUL despite sep != 0 - * (see sep = 1 << CHAR_BIT above) */ - STPUTC(sep, q); - expdest = q; + memtodest(&sepc, 1, syntax, quotes); } } - return len; + break; } /* case '@' and '*' */ case '0': case '1': @@ -6740,9 +6734,7 @@ varvalue(char *name, int varflags, int flags, struct strlist *var_str_list) if (!p) return -1; - len = strlen(p); - if (!(subtype == VSPLUS || subtype == VSLENGTH)) - memtodest(p, len, syntax, quotes); + len = strtodest(p, syntax, quotes); #if ENABLE_UNICODE_SUPPORT if (subtype == VSLENGTH && len > 0) { reinit_unicode_for_ash(); @@ -6751,10 +6743,10 @@ varvalue(char *name, int varflags, int flags, struct strlist *var_str_list) } } #endif - return len; + break; } - if (subtype == VSPLUS || subtype == VSLENGTH) + if (discard) STADJUST(-len, expdest); return len; } @@ -6870,7 +6862,7 @@ evalvar(char *p, int flags, struct strlist *var_str_list) patloc = expdest - (char *)stackblock(); if (NULL == subevalvar(p, /* varname: */ NULL, patloc, subtype, startloc, varflags, - /* quotes: */ flags & (EXP_FULL | EXP_CASE | EXP_REDIR), + /* quotes: */ flags & QUOTES_ESC, var_str_list) ) { int amount = expdest - ( |