static char *
stputs_split(const char *data, const char *syntax, int flag, char *p,
struct worddest *dst)
{
const char *ifs;
char c;
ifs = ifsset() ? ifsval() : " \t\n";
while (*data) {
CHECKSTRSPACE(2, p);
c = *data++;
if (strchr(ifs, c) != NULL) {
NEXTWORD(c, flag, p, dst);
continue;
}
if (flag & EXP_GLOB && syntax[(int)c] == CCTL)
USTPUTC(CTLESC, p);
USTPUTC(c, p);
}
return (p);
}
/*
* Break the argument string into pieces based upon IFS and add the
* strings to the argument list. The regions of the string to be
* searched for IFS characters have been stored by recordregion.
* CTLESC characters are preserved but have little effect in this pass
* other than escaping CTL* characters. In particular, they do not escape
* IFS characters: that should be done with the ifsregion mechanism.
* CTLQUOTEMARK characters are used to preserve empty quoted strings.
* This pass treats them as a regular character, making the string non-empty.
* Later, they are removed along with the other CTL* characters.
*/
static void
ifsbreakup(char *string, struct arglist *arglist)
{
struct ifsregion *ifsp;
struct strlist *sp;
char *start;
char *p;
char *q;
const char *ifs;
const char *ifsspc;
int had_param_ch = 0;
start = string;
if (ifslastp == NULL) {
/* Return entire argument, IFS doesn't apply to any of it */
sp = (struct strlist *)stalloc(sizeof *sp);
sp->text = start;
*arglist->lastp = sp;
arglist->lastp = &sp->next;
return;
}
ifs = ifsset() ? ifsval() : " \t\n";
for (ifsp = &ifsfirst; ifsp != NULL; ifsp = ifsp->next) {
p = string + ifsp->begoff;
while (p < string + ifsp->endoff) {
q = p;
if (*p == CTLESC)
p++;
if (ifsp->inquotes) {
/* Only NULs (should be from "$@") end args */
had_param_ch = 1;
if (*p != 0) {
p++;
continue;
}
ifsspc = NULL;
} else {
if (!strchr(ifs, *p)) {
had_param_ch = 1;
p++;
continue;
}
ifsspc = strchr(" \t\n", *p);
/* Ignore IFS whitespace at start */
if (q == start && ifsspc != NULL) {
p++;
start = p;
continue;
}
had_param_ch = 0;
}
/* Save this argument... */
*q = '\0';
sp = (struct strlist *)stalloc(sizeof *sp);
sp->text = start;
*arglist->lastp = sp;
arglist->lastp = &sp->next;
p++;
if (ifsspc != NULL) {
/* Ignore further trailing IFS whitespace */
for (; p < string + ifsp->endoff; p++) {
q = p;
if (*p == CTLESC)
p++;
if (strchr(ifs, *p) == NULL) {
p = q;
break;
}
if (strchr(" \t\n", *p) == NULL) {
p++;
break;
}
}
}
start = p;
}
}
/*
* Save anything left as an argument.
* Traditionally we have treated 'IFS=':'; set -- x$IFS' as
* generating 2 arguments, the second of which is empty.
* Some recent clarification of the Posix spec say that it
* should only generate one....
*/
if (had_param_ch || *start != 0) {
sp = (struct strlist *)stalloc(sizeof *sp);
sp->text = start;
*arglist->lastp = sp;
arglist->lastp = &sp->next;
}
}
static void
varvalue(const char *name, int quoted, int subtype, int flag)
{
int num;
char *p;
int i;
char sep[2];
char **ap;
switch (*name) {
case '$':
num = rootpid;
break;
case '?':
num = oexitstatus;
break;
case '#':
num = shellparam.nparam;
break;
case '!':
num = backgndpidval();
break;
case '-':
for (i = 0 ; i < NOPTS ; i++) {
if (optlist[i].val)
STPUTC(optlist[i].letter, expdest);
}
return;
case '@':
if (flag & EXP_FULL && quoted) {
for (ap = shellparam.p ; (p = *ap++) != NULL ; ) {
strtodest(p, flag, subtype, quoted);
if (*ap)
STPUTC('\0', expdest);
}
return;
}
/* FALLTHROUGH */
case '*':
if (ifsset())
sep[0] = ifsval()[0];
else
sep[0] = ' ';
sep[1] = '\0';
for (ap = shellparam.p ; (p = *ap++) != NULL ; ) {
strtodest(p, flag, subtype, quoted);
if (!*ap)
break;
if (sep[0])
strtodest(sep, flag, subtype, quoted);
else if (flag & EXP_FULL && !quoted && **ap != '\0')
STPUTC('\0', expdest);
}
return;
default:
if (is_digit(*name)) {
num = atoi(name);
if (num == 0)
p = arg0;
else if (num > 0 && num <= shellparam.nparam)
p = shellparam.p[num - 1];
else
return;
strtodest(p, flag, subtype, quoted);
}
return;
}
expdest = cvtnum(num, expdest);
}
static char *
evalvar(char *p, int flag)
{
int subtype;
int varflags;
char *var;
const char *val;
int patloc;
int c;
int set;
int special;
int startloc;
int varlen;
int varlenb;
int easy;
int quotes = flag & (EXP_FULL | EXP_CASE);
int record = 0;
varflags = (unsigned char)*p++;
subtype = varflags & VSTYPE;
var = p;
special = 0;
if (! is_name(*p))
special = 1;
p = strchr(p, '=') + 1;
again: /* jump here after setting a variable with ${var=text} */
if (varflags & VSLINENO) {
set = 1;
special = 1;
val = NULL;
} else if (special) {
set = varisset(var, varflags & VSNUL);
val = NULL;
} else {
val = bltinlookup(var, 1);
if (val == NULL || ((varflags & VSNUL) && val[0] == '\0')) {
val = NULL;
set = 0;
} else
set = 1;
}
varlen = 0;
startloc = expdest - stackblock();
if (!set && uflag && *var != '@' && *var != '*') {
switch (subtype) {
case VSNORMAL:
case VSTRIMLEFT:
case VSTRIMLEFTMAX:
case VSTRIMRIGHT:
case VSTRIMRIGHTMAX:
case VSLENGTH:
error("%.*s: parameter not set", (int)(p - var - 1),
var);
}
}
if (set && subtype != VSPLUS) {
/* insert the value of the variable */
if (special) {
if (varflags & VSLINENO)
STPUTBIN(var, p - var - 1, expdest);
else
varvalue(var, varflags & VSQUOTE, subtype, flag);
if (subtype == VSLENGTH) {
varlenb = expdest - stackblock() - startloc;
varlen = varlenb;
if (localeisutf8) {
val = stackblock() + startloc;
for (;val != expdest; val++)
if ((*val & 0xC0) == 0x80)
varlen--;
}
STADJUST(-varlenb, expdest);
}
} else {
if (subtype == VSLENGTH) {
for (;*val; val++)
if (!localeisutf8 ||
(*val & 0xC0) != 0x80)
varlen++;
}
else
strtodest(val, flag, subtype,
varflags & VSQUOTE);
}
}
if (subtype == VSPLUS)
set = ! set;
easy = ((varflags & VSQUOTE) == 0 ||
(*var == '@' && shellparam.nparam != 1));
switch (subtype) {
case VSLENGTH:
expdest = cvtnum(varlen, expdest);
record = 1;
break;
case VSNORMAL:
record = easy;
break;
case VSPLUS:
case VSMINUS:
if (!set) {
argstr(p, flag | (flag & EXP_FULL ? EXP_SPLIT_LIT : 0) |
(varflags & VSQUOTE ? EXP_LIT_QUOTED : 0));
break;
}
record = easy;
break;
case VSTRIMLEFT:
case VSTRIMLEFTMAX:
case VSTRIMRIGHT:
case VSTRIMRIGHTMAX:
if (!set)
break;
/*
* Terminate the string and start recording the pattern
* right after it
*/
STPUTC('\0', expdest);
patloc = expdest - stackblock();
if (subevalvar(p, NULL, patloc, subtype,
startloc, varflags, quotes) == 0) {
int amount = (expdest - stackblock() - patloc) + 1;
STADJUST(-amount, expdest);
}
/* Remove any recorded regions beyond start of variable */
removerecordregions(startloc);
record = 1;
break;
case VSASSIGN:
case VSQUESTION:
if (!set) {
if (subevalvar(p, var, 0, subtype, startloc, varflags,
quotes)) {
varflags &= ~VSNUL;
/*
* Remove any recorded regions beyond
* start of variable
*/
removerecordregions(startloc);
goto again;
}
break;
}
record = easy;
break;
case VSERROR:
c = p - var - 1;
error("${%.*s%s}: Bad substitution", c, var,
(c > 0 && *p != CTLENDVAR) ? "..." : "");
default:
abort();
}
if (record)
recordregion(startloc, expdest - stackblock(),
varflags & VSQUOTE || (ifsset() && ifsval()[0] == '\0' &&
(*var == '@' || *var == '*')));
if (subtype != VSNORMAL) { /* skip to end of alternative */
int nesting = 1;
for (;;) {
if ((c = *p++) == CTLESC)
p++;
else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) {
if (set)
argbackq = argbackq->next;
} else if (c == CTLVAR) {
if ((*p++ & VSTYPE) != VSNORMAL)
nesting++;
} else if (c == CTLENDVAR) {
if (--nesting == 0)
break;
}
}
}
return p;
}
STATIC void
varvalue(shinstance *psh, char *name, int quoted, int subtype, int flag)
{
int num;
char *p;
int i;
char sep;
char **ap;
char const *syntax;
#define STRTODEST(p) \
do {\
if (flag & (EXP_FULL | EXP_CASE) && subtype != VSLENGTH) { \
syntax = quoted? DQSYNTAX : BASESYNTAX; \
while (*p) { \
if (syntax[(int)*p] == CCTL) \
STPUTC(psh, CTLESC, psh->expdest); \
STPUTC(psh, *p++, psh->expdest); \
} \
} else \
while (*p) \
STPUTC(psh, *p++, psh->expdest); \
} while (0)
switch (*name) {
case '$':
num = psh->rootpid;
goto numvar;
case '?':
num = psh->exitstatus;
goto numvar;
case '#':
num = psh->shellparam.nparam;
goto numvar;
case '!':
num = psh->backgndpid;
numvar:
psh->expdest = cvtnum(psh, num, psh->expdest);
break;
case '-':
for (i = 0; psh->optlist[i].name; i++) {
if (psh->optlist[i].val)
STPUTC(psh, psh->optlist[i].letter, psh->expdest);
}
break;
case '@':
if (flag & EXP_FULL && quoted) {
for (ap = psh->shellparam.p ; (p = *ap++) != NULL ; ) {
STRTODEST(p);
if (*ap)
STPUTC(psh, '\0', psh->expdest);
}
break;
}
/* fall through */
case '*':
if (ifsset(psh) != 0)
sep = ifsval(psh)[0];
else
sep = ' ';
for (ap = psh->shellparam.p ; (p = *ap++) != NULL ; ) {
STRTODEST(p);
if (*ap && sep)
STPUTC(psh, sep, psh->expdest);
}
break;
case '0':
p = psh->arg0;
STRTODEST(p);
break;
default:
if (is_digit(*name)) {
num = atoi(name);
if (num > 0 && num <= psh->shellparam.nparam) {
p = psh->shellparam.p[num - 1];
STRTODEST(p);
}
}
break;
}
}
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;
}
}
}
STATIC void
varvalue(char *name, int quoted, int subtype, int flag)
{
int num;
char *p;
int i;
char sep;
char **ap;
char const *syntax;
#define STRTODEST(p) \
do {\
if (flag & (EXP_FULL | EXP_CASE) && subtype != VSLENGTH) { \
syntax = quoted? DQSYNTAX : BASESYNTAX; \
while (*p) { \
if (syntax[(int)*p] == CCTL) \
STPUTC(CTLESC, expdest); \
STPUTC(*p++, expdest); \
} \
} else \
while (*p) \
STPUTC(*p++, expdest); \
} while (0)
switch (*name) {
case '$':
num = rootpid;
goto numvar;
case '?':
num = exitstatus;
goto numvar;
case '#':
num = shellparam.nparam;
goto numvar;
case '!':
num = backgndpid;
numvar:
expdest = cvtnum(num, expdest);
break;
case '-':
for (i = 0; optlist[i].name; i++) {
if (optlist[i].val && optlist[i].letter)
STPUTC(optlist[i].letter, expdest);
}
break;
case '@':
if (flag & EXP_FULL && quoted) {
for (ap = shellparam.p ; (p = *ap++) != NULL ; ) {
STRTODEST(p);
if (*ap)
/* A NUL separates args inside "" */
STPUTC('\0', expdest);
}
break;
}
/* fall through */
case '*':
if (ifsset() != 0)
sep = ifsval()[0];
else
sep = ' ';
for (ap = shellparam.p ; (p = *ap++) != NULL ; ) {
STRTODEST(p);
if (*ap && sep)
STPUTC(sep, expdest);
}
break;
case '0':
p = arg0;
STRTODEST(p);
break;
default:
if (is_digit(*name)) {
num = atoi(name);
if (num > 0 && num <= shellparam.nparam) {
p = shellparam.p[num - 1];
STRTODEST(p);
}
}
break;
}
}
static void
varvalue(const_cstring_t name, int32_t quoted, int32_t subtype, int32_t flag)
{
int32_t num;
cstring_t p;
int32_t i;
char sep;
cstring_t* ap;
switch (*name)
{
case '$':
num = rootpid;
goto numvar;
case '?':
num = oexitstatus;
goto numvar;
case '#':
num = shellparam.nparam;
goto numvar;
case '!':
num = backgndpidval();
numvar:
expdest = cvtnum(num, expdest);
break;
case '-':
for (i = 0 ; i < NOPTS ; i++)
{
if (optlist[i].val)
STPUTC(optlist[i].letter, expdest);
}
break;
case '@':
if (flag & EXP_FULL && quoted)
{
for (ap = shellparam.p ; (p = *ap++) != NULL ;)
{
strtodest(p, flag, subtype, quoted);
if (*ap)
STPUTC('\0', expdest);
}
break;
}
/* FALLTHROUGH */
case '*':
if (ifsset())
sep = ifsval()[0];
else
sep = ' ';
for (ap = shellparam.p ; (p = *ap++) != NULL ;)
{
strtodest(p, flag, subtype, quoted);
if (!*ap)
break;
if (sep || (flag & EXP_FULL && !quoted &&** ap != '\0'))
STPUTC(sep, expdest);
}
break;
default:
if (is_digit(*name))
{
num = atoi(name);
if (num == 0)
p = arg0;
else if (num > 0 && num <= shellparam.nparam)
p = shellparam.p[num - 1];
else
break;
strtodest(p, flag, subtype, quoted);
}
break;
}
}
static void
varvalue(const char *name, int quoted, int subtype, int flag,
struct worddest *dst)
{
int num;
char *p;
int i;
int splitlater;
char sep[2];
char **ap;
char buf[(NSHORTOPTS > 10 ? NSHORTOPTS : 10) + 1];
if (subtype == VSLENGTH)
flag &= ~EXP_FULL;
splitlater = subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX ||
subtype == VSTRIMRIGHT || subtype == VSTRIMRIGHTMAX;
switch (*name) {
case '$':
num = rootpid;
break;
case '?':
num = oexitstatus;
break;
case '#':
num = shellparam.nparam;
break;
case '!':
num = backgndpidval();
break;
case '-':
p = buf;
for (i = 0 ; i < NSHORTOPTS ; i++) {
if (optlist[i].val)
*p++ = optlist[i].letter;
}
*p = '\0';
strtodest(buf, flag, subtype, quoted, dst);
return;
case '@':
if (flag & EXP_SPLIT && quoted) {
for (ap = shellparam.p ; (p = *ap++) != NULL ; ) {
strtodest(p, flag, subtype, quoted, dst);
if (*ap) {
if (splitlater)
STPUTC('\0', expdest);
else
NEXTWORD('\0', flag, expdest,
dst);
}
}
if (shellparam.nparam > 0)
dst->state = WORD_QUOTEMARK;
return;
}
/* FALLTHROUGH */
case '*':
if (ifsset())
sep[0] = ifsval()[0];
else
sep[0] = ' ';
sep[1] = '\0';
for (ap = shellparam.p ; (p = *ap++) != NULL ; ) {
strtodest(p, flag, subtype, quoted, dst);
if (!*ap)
break;
if (sep[0])
strtodest(sep, flag, subtype, quoted, dst);
else if (flag & EXP_SPLIT && !quoted && **ap != '\0') {
if (splitlater)
STPUTC('\0', expdest);
else
NEXTWORD('\0', flag, expdest, dst);
}
}
return;
default:
if (is_digit(*name)) {
num = atoi(name);
if (num == 0)
p = arg0;
else if (num > 0 && num <= shellparam.nparam)
p = shellparam.p[num - 1];
else
return;
strtodest(p, flag, subtype, quoted, dst);
}
return;
}
cvtnum(num, buf);
strtodest(buf, flag, subtype, quoted, dst);
}
/*
* Perform command substitution.
*/
static void
expbackq(union node *cmd, int quoted, int flag, struct worddest *dst)
{
struct backcmd in;
int i;
char buf[128];
char *p;
char *dest = expdest;
struct nodelist *saveargbackq;
char lastc;
char const *syntax = quoted? DQSYNTAX : BASESYNTAX;
int quotes = flag & (EXP_GLOB | EXP_CASE);
size_t nnl;
const char *ifs;
INTOFF;
saveargbackq = argbackq;
p = grabstackstr(dest);
evalbackcmd(cmd, &in);
ungrabstackstr(p, dest);
argbackq = saveargbackq;
p = in.buf;
lastc = '\0';
nnl = 0;
if (!quoted && flag & EXP_SPLIT)
ifs = ifsset() ? ifsval() : " \t\n";
else
ifs = "";
/* Don't copy trailing newlines */
for (;;) {
if (--in.nleft < 0) {
if (in.fd < 0)
break;
while ((i = read(in.fd, buf, sizeof buf)) < 0 && errno == EINTR);
TRACE(("expbackq: read returns %d\n", i));
if (i <= 0)
break;
p = buf;
in.nleft = i - 1;
}
lastc = *p++;
if (lastc == '\0')
continue;
if (lastc == '\n') {
nnl++;
} else {
if (nnl > 0) {
if (strchr(ifs, '\n') != NULL) {
NEXTWORD('\n', flag, dest, dst);
nnl = 0;
} else {
CHECKSTRSPACE(nnl + 2, dest);
while (nnl > 0) {
nnl--;
USTPUTC('\n', dest);
}
}
}
if (strchr(ifs, lastc) != NULL)
NEXTWORD(lastc, flag, dest, dst);
else {
CHECKSTRSPACE(2, dest);
if (quotes && syntax[(int)lastc] == CCTL)
USTPUTC(CTLESC, dest);
USTPUTC(lastc, dest);
}
}
}
if (in.fd >= 0)
close(in.fd);
if (in.buf)
ckfree(in.buf);
if (in.jp)
exitstatus = waitforjob(in.jp, (int *)NULL);
TRACE(("expbackq: size=%td: \"%.*s\"\n",
((dest - stackblock()) - startloc),
(int)((dest - stackblock()) - startloc),
stackblock() + startloc));
expdest = dest;
INTON;
}
/*
* 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);
}
}
}
/*
* Break the argument string into pieces based upon IFS and add the
* strings to the argument list. The regions of the string to be
* searched for IFS characters have been stored by recordregion.
*/
STATIC void
ifsbreakup(char *string, struct arglist *arglist)
{
struct ifsregion *ifsp;
struct strlist *sp;
char *start;
char *p;
char *q;
char *ifs;
int ifsspc;
int nulonly;
start = string;
ifsspc = 0;
nulonly = 0;
if (ifslastp != NULL) {
ifsp = &ifsfirst;
do {
p = string + ifsp->begoff;
nulonly = ifsp->nulonly;
ifs = nulonly ? nullstr :
( ifsset() ? ifsval() : " \t\n" );
ifsspc = 0;
while (p < string + ifsp->endoff) {
q = p;
if (*p == CTLESC)
p++;
if (strchr(ifs, *p)) {
if (!nulonly)
ifsspc = (strchr(" \t\n", *p) != NULL);
/* Ignore IFS whitespace at start */
if (q == start && ifsspc) {
p++;
start = p;
continue;
}
*q = '\0';
sp = (struct strlist *)stalloc(sizeof *sp);
sp->text = start;
*arglist->lastp = sp;
arglist->lastp = &sp->next;
p++;
if (!nulonly) {
for (;;) {
if (p >= string + ifsp->endoff) {
break;
}
q = p;
if (*p == CTLESC)
p++;
if (strchr(ifs, *p) == NULL ) {
p = q;
break;
} else if (strchr(" \t\n",*p) == NULL) {
if (ifsspc) {
p++;
ifsspc = 0;
} else {
p = q;
break;
}
} else
p++;
}
}
start = p;
} else
p++;
}
} while ((ifsp = ifsp->next) != NULL);
if (*start || (!ifsspc && start > string)) {
sp = (struct strlist *)stalloc(sizeof *sp);
sp->text = start;
*arglist->lastp = sp;
arglist->lastp = &sp->next;
}
} else {
sp = (struct strlist *)stalloc(sizeof *sp);
sp->text = start;
*arglist->lastp = sp;
arglist->lastp = &sp->next;
}
}