/*
* Perform parameter expansion, command substitution and arithmetic
* expansion, and tilde expansion if requested via EXP_TILDE/EXP_VARTILDE.
* Processing ends at a CTLENDVAR or CTLENDARI character as well as '\0'.
* This is used to expand word in ${var+word} etc.
* If EXP_FULL or EXP_CASE are set, keep and/or generate CTLESC
* characters to allow for further processing.
* If EXP_FULL is set, also preserve CTLQUOTEMARK characters.
*/
static char *
argstr(char *p, int flag)
{
char c;
int quotes = flag & (EXP_FULL | EXP_CASE); /* do CTLESC */
int firsteq = 1;
int split_lit;
int lit_quoted;
split_lit = flag & EXP_SPLIT_LIT;
lit_quoted = flag & EXP_LIT_QUOTED;
flag &= ~(EXP_SPLIT_LIT | EXP_LIT_QUOTED);
if (*p == '~' && (flag & (EXP_TILDE | EXP_VARTILDE)))
p = exptilde(p, flag);
for (;;) {
CHECKSTRSPACE(2, expdest);
switch (c = *p++) {
case '\0':
return (p - 1);
case CTLENDVAR:
case CTLENDARI:
return (p);
case CTLQUOTEMARK:
lit_quoted = 1;
/* "$@" syntax adherence hack */
if (p[0] == CTLVAR && p[2] == '@' && p[3] == '=')
break;
if ((flag & EXP_FULL) != 0)
USTPUTC(c, expdest);
break;
case CTLQUOTEEND:
lit_quoted = 0;
break;
case CTLESC:
if (quotes)
USTPUTC(c, expdest);
c = *p++;
USTPUTC(c, expdest);
if (split_lit && !lit_quoted)
recordregion(expdest - stackblock() -
(quotes ? 2 : 1),
expdest - stackblock(), 0);
break;
case CTLVAR:
p = evalvar(p, flag);
break;
case CTLBACKQ:
case CTLBACKQ|CTLQUOTE:
expbackq(argbackq->n, c & CTLQUOTE, flag);
argbackq = argbackq->next;
break;
case CTLARI:
p = expari(p);
break;
case ':':
case '=':
/*
* sort of a hack - expand tildes in variable
* assignments (after the first '=' and after ':'s).
*/
USTPUTC(c, expdest);
if (split_lit && !lit_quoted)
recordregion(expdest - stackblock() - 1,
expdest - stackblock(), 0);
if (flag & EXP_VARTILDE && *p == '~' &&
(c != '=' || firsteq)) {
if (c == '=')
firsteq = 0;
p = exptilde(p, flag);
}
break;
default:
USTPUTC(c, expdest);
if (split_lit && !lit_quoted)
recordregion(expdest - stackblock() - 1,
expdest - stackblock(), 0);
}
}
}
STATIC void
argstr(shinstance *psh, char *p, int flag)
{
char c;
int quotes = flag & (EXP_FULL | EXP_CASE); /* do CTLESC */
int firsteq = 1;
const char *ifs = NULL;
int ifs_split = EXP_IFS_SPLIT;
if (flag & EXP_IFS_SPLIT)
ifs = ifsset(psh) ? ifsval(psh) : " \t\n";
if (*p == '~' && (flag & (EXP_TILDE | EXP_VARTILDE)))
p = exptilde(psh, p, flag);
for (;;) {
switch (c = *p++) {
case '\0':
case CTLENDVAR: /* end of expanding yyy in ${xxx-yyy} */
return;
case CTLQUOTEMARK:
/* "$@" syntax adherence hack */
if (p[0] == CTLVAR && p[2] == '@' && p[3] == '=')
break;
if ((flag & EXP_FULL) != 0)
STPUTC(psh, c, psh->expdest);
ifs_split = 0;
break;
case CTLQUOTEEND:
ifs_split = EXP_IFS_SPLIT;
break;
case CTLESC:
if (quotes)
STPUTC(psh, c, psh->expdest);
c = *p++;
STPUTC(psh, c, psh->expdest);
break;
case CTLVAR:
p = evalvar(psh, p, (flag & ~EXP_IFS_SPLIT) | (flag & ifs_split));
break;
case CTLBACKQ:
case CTLBACKQ|CTLQUOTE:
expbackq(psh, psh->argbackq->n, c & CTLQUOTE, flag);
psh->argbackq = psh->argbackq->next;
break;
case CTLENDARI:
expari(psh, flag);
break;
case ':':
case '=':
/*
* sort of a hack - expand tildes in variable
* assignments (after the first '=' and after ':'s).
*/
STPUTC(psh, c, psh->expdest);
if (flag & EXP_VARTILDE && *p == '~') {
if (c == '=') {
if (firsteq)
firsteq = 0;
else
break;
}
p = exptilde(psh, p, flag);
}
break;
default:
STPUTC(psh, c, psh->expdest);
if (flag & EXP_IFS_SPLIT & ifs_split && strchr(ifs, c) != NULL) {
/* We need to get the output split here... */
recordregion(psh, (int)(psh->expdest - stackblock(psh) - 1),
(int)(psh->expdest - stackblock(psh)), 0);
}
break;
}
}
}
/*
* Perform parameter expansion, command substitution and arithmetic
* expansion, and tilde expansion if requested via EXP_TILDE/EXP_VARTILDE.
* Processing ends at a CTLENDVAR or CTLENDARI character as well as '\0'.
* This is used to expand word in ${var+word} etc.
* If EXP_GLOB or EXP_CASE are set, keep and/or generate CTLESC
* characters to allow for further processing.
*
* If EXP_SPLIT is set, dst receives any complete words produced.
*/
static char *
argstr(char *p, int flag, struct worddest *dst)
{
char c;
int quotes = flag & (EXP_GLOB | EXP_CASE); /* do CTLESC */
int firsteq = 1;
int split_lit;
int lit_quoted;
split_lit = flag & EXP_SPLIT_LIT;
lit_quoted = flag & EXP_LIT_QUOTED;
flag &= ~(EXP_SPLIT_LIT | EXP_LIT_QUOTED);
if (*p == '~' && (flag & (EXP_TILDE | EXP_VARTILDE)))
p = exptilde(p, flag);
for (;;) {
CHECKSTRSPACE(2, expdest);
switch (c = *p++) {
case '\0':
return (p - 1);
case CTLENDVAR:
case CTLENDARI:
return (p);
case CTLQUOTEMARK:
lit_quoted = 1;
/* "$@" syntax adherence hack */
if (p[0] == CTLVAR && (p[1] & VSQUOTE) != 0 &&
p[2] == '@' && p[3] == '=')
break;
if ((flag & EXP_SPLIT) != 0 && expdest == stackblock())
dst->state = WORD_QUOTEMARK;
break;
case CTLQUOTEEND:
lit_quoted = 0;
break;
case CTLESC:
c = *p++;
if (split_lit && !lit_quoted &&
strchr(ifsset() ? ifsval() : " \t\n", c) != NULL) {
NEXTWORD(c, flag, expdest, dst);
break;
}
if (quotes)
USTPUTC(CTLESC, expdest);
USTPUTC(c, expdest);
break;
case CTLVAR:
p = evalvar(p, flag, dst);
break;
case CTLBACKQ:
case CTLBACKQ|CTLQUOTE:
expbackq(argbackq->n, c & CTLQUOTE, flag, dst);
argbackq = argbackq->next;
break;
case CTLARI:
p = expari(p, flag, dst);
break;
case ':':
case '=':
/*
* sort of a hack - expand tildes in variable
* assignments (after the first '=' and after ':'s).
*/
if (split_lit && !lit_quoted &&
strchr(ifsset() ? ifsval() : " \t\n", c) != NULL) {
NEXTWORD(c, flag, expdest, dst);
break;
}
USTPUTC(c, expdest);
if (flag & EXP_VARTILDE && *p == '~' &&
(c != '=' || firsteq)) {
if (c == '=')
firsteq = 0;
p = exptilde(p, flag);
}
break;
default:
if (split_lit && !lit_quoted &&
strchr(ifsset() ? ifsval() : " \t\n", c) != NULL) {
NEXTWORD(c, flag, expdest, dst);
break;
}
USTPUTC(c, expdest);
}
}
}
PUBLIC WORD parse(INT old_nesting)
{
int nesting = (int) old_nesting;
int quoted;
nextsym();
if( symb==s_eof ) return nesting;
parse_depth++;
if( ( quoted = (symb==s_quote) ) != 0 ) nextsym();
/* trace("Parse %squoted depth %d",quoted?"":"un",parse_depth); */
for(;;)
{
switch ( (int)symb )
{
case s_builtin: if(!quoted) { builtin(); break; }
case s_macro: if(!quoted) { eval(); break; }
case s_hexvar:
case s_var: if(!quoted) { evalvar(); break; }
default:
case s_token:
if( toksize == 1 ) wrch(token[0]);
else wrstr(token);
break;
case s_lbra:
if( nesting++ > 0) wrch(c_lbra);
break;
case s_rbra:
if( --nesting > 0 ) wrch(c_rbra);
break;
case s_eof: return nesting;
case s_quote:
if( quoted ) wrch(c_quote);
pbchar(c_quote);
nesting = (int) parse((WORD)nesting);
break;
case s_concat:
if( quoted ) wrch(c_concat);
break;
}
if ( nesting <= old_nesting ) break;
nextsym();
}
parse_depth--;
return nesting;
}
STATIC void
argstr(char *p, int flag)
{
char c;
int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); /* do CTLESC */
int firsteq = 1;
if (*p == '~' && (flag & (EXP_TILDE | EXP_VARTILDE)))
p = exptilde(p, flag);
for (;;) {
switch (c = *p++) {
case '\0':
case CTLENDVAR: /* ??? */
goto breakloop;
case CTLQUOTEMARK:
/* "$@" syntax adherence hack */
if (p[0] == CTLVAR && p[2] == '@' && p[3] == '=')
break;
if ((flag & EXP_FULL) != 0)
STPUTC(c, expdest);
break;
case CTLESC:
if (quotes)
STPUTC(c, expdest);
c = *p++;
STPUTC(c, expdest);
break;
case CTLVAR:
p = evalvar(p, flag);
break;
case CTLBACKQ:
case CTLBACKQ|CTLQUOTE:
expbackq(argbackq->n, c & CTLQUOTE, flag);
argbackq = argbackq->next;
break;
case CTLENDARI:
expari(flag);
break;
case ':':
case '=':
/*
* sort of a hack - expand tildes in variable
* assignments (after the first '=' and after ':'s).
*/
STPUTC(c, expdest);
if (flag & EXP_VARTILDE && *p == '~') {
if (c == '=') {
if (firsteq)
firsteq = 0;
else
break;
}
p = exptilde(p, flag);
}
break;
default:
STPUTC(c, expdest);
}
}
breakloop:;
}
