ref: 9d09242bee8489b6cdee246489063488bb52b1fb
dir: /sys/src/ape/cmd/pdksh/misc.c/
/*
* Miscellaneous functions
*/
#include "sh.h"
#include <ctype.h> /* for FILECHCONV */
#ifdef HAVE_LIMITS_H
# include <limits.h>
#endif
#ifndef UCHAR_MAX
# define UCHAR_MAX 0xFF
#endif
short ctypes [UCHAR_MAX+1]; /* type bits for unsigned char */
static int do_gmatch ARGS((const unsigned char *s, const unsigned char *p,
const unsigned char *se, const unsigned char *pe,
int isfile));
static const unsigned char *cclass ARGS((const unsigned char *p, int sub));
/*
* Fast character classes
*/
void
setctypes(register const char *s, register int t)
{
register int i;
if (t & C_IFS) {
for (i = 0; i < UCHAR_MAX+1; i++)
ctypes[i] &= ~C_IFS;
ctypes[0] |= C_IFS; /* include \0 in C_IFS */
}
while (*s != 0)
ctypes[(unsigned char) *s++] |= t;
}
void
initctypes(void)
{
register int c;
for (c = 'a'; c <= 'z'; c++)
ctypes[c] |= C_ALPHA;
for (c = 'A'; c <= 'Z'; c++)
ctypes[c] |= C_ALPHA;
ctypes['_'] |= C_ALPHA;
setctypes("0123456789", C_DIGIT);
setctypes(" \t\n|&;<>()", C_LEX1); /* \0 added automatically */
setctypes("*@#!$-?", C_VAR1);
setctypes(" \t\n", C_IFSWS);
setctypes("=-+?", C_SUBOP1);
setctypes("#%", C_SUBOP2);
setctypes(" \n\t\"#$&'()*;<>?[\\`|", C_QUOTE);
}
/* convert unsigned long to base N string */
char *
ulton(register unsigned long n, int base)
{
register char *p;
static char buf [20];
p = &buf[sizeof(buf)];
*--p = '\0';
do {
*--p = "0123456789ABCDEF"[n%base];
n /= base;
} while (n != 0);
return p;
}
char *
str_save(register const char *s, Area *ap)
{
return s ? strcpy((char*) alloc((size_t)strlen(s)+1, ap), s) : NULL;
}
/* Allocate a string of size n+1 and copy upto n characters from the possibly
* null terminated string s into it. Always returns a null terminated string
* (unless n < 0).
*/
char *
str_nsave(register const char *s, int n, Area *ap)
{
char *ns;
if (n < 0)
return 0;
ns = alloc(n + 1, ap);
ns[0] = '\0';
return strncat(ns, s, n);
}
/* called from expand.h:XcheckN() to grow buffer */
char *
Xcheck_grow_(XString *xsp, char *xp, int more)
{
char *old_beg = xsp->beg;
xsp->len += more > xsp->len ? more : xsp->len;
xsp->beg = aresize(xsp->beg, xsp->len + 8, xsp->areap);
xsp->end = xsp->beg + xsp->len;
return xsp->beg + (xp - old_beg);
}
const struct option options[] = {
/* Special cases (see parse_args()): -A, -o, -s.
* Options are sorted by their longnames - the order of these
* entries MUST match the order of sh_flag F* enumerations in sh.h.
*/
{ "allexport", 'a', OF_ANY },
#ifdef BRACE_EXPAND
{ "braceexpand", 0, OF_ANY }, /* non-standard */
#endif
{ "bgnice", 0, OF_ANY },
{ (char *) 0, 'c', OF_CMDLINE },
{ "errexit", 'e', OF_ANY },
{ "ignoreeof", 0, OF_ANY },
{ "interactive",'i', OF_CMDLINE },
{ "keyword", 'k', OF_ANY },
{ "login", 'l', OF_CMDLINE },
{ "markdirs", 'X', OF_ANY },
#ifdef JOBS
{ "monitor", 'm', OF_ANY },
#else /* JOBS */
{ (char *) 0, 'm', 0 }, /* so FMONITOR not ifdef'd */
#endif /* JOBS */
{ "noclobber", 'C', OF_ANY },
{ "noexec", 'n', OF_ANY },
{ "noglob", 'f', OF_ANY },
{ "nohup", 0, OF_ANY },
{ "nointeractive", 'I', OF_CMDLINE },
{ "nolog", 0, OF_ANY }, /* no effect */
#ifdef JOBS
{ "notify", 'b', OF_ANY },
#endif /* JOBS */
{ "nounset", 'u', OF_ANY },
{ "physical", 0, OF_ANY }, /* non-standard */
{ "posix", 0, OF_ANY }, /* non-standard */
{ "privileged", 'p', OF_ANY },
{ "restricted", 'r', OF_CMDLINE },
{ "stdin", 's', OF_CMDLINE }, /* pseudo non-standard */
{ "trackall", 'h', OF_ANY },
{ "verbose", 'v', OF_ANY },
{ "xtrace", 'x', OF_ANY },
/* Anonymous flags: used internally by shell only
* (not visable to user)
*/
{ (char *) 0, 0, OF_INTERNAL }, /* FTALKING_I */
};
/*
* translate -o option into F* constant (also used for test -o option)
*/
int
option(const char *n)
{
int i;
for (i = 0; i < NELEM(options); i++)
if (options[i].name && strcmp(options[i].name, n) == 0)
return i;
return -1;
}
struct options_info {
int opt_width;
struct {
const char *name;
int flag;
} opts[NELEM(options)];
};
static char *options_fmt_entry ARGS((void *arg, int i, char *buf, int buflen));
static void printoptions ARGS((int verbose));
/* format a single select menu item */
static char *
options_fmt_entry(void *arg, int i, char *buf, int buflen)
{
struct options_info *oi = (struct options_info *) arg;
shf_snprintf(buf, buflen, "%-*s %s",
oi->opt_width, oi->opts[i].name,
Flag(oi->opts[i].flag) ? "on" : "off");
return buf;
}
static void
printoptions(int verbose)
{
int i;
if (verbose) {
struct options_info oi;
int n, len;
/* verbose version */
shprintf("Current option settings\n");
for (i = n = oi.opt_width = 0; i < NELEM(options); i++)
if (options[i].name) {
len = strlen(options[i].name);
oi.opts[n].name = options[i].name;
oi.opts[n++].flag = i;
if (len > oi.opt_width)
oi.opt_width = len;
}
print_columns(shl_stdout, n, options_fmt_entry, &oi,
oi.opt_width + 5);
} else {
/* short version ala ksh93 */
shprintf("set");
for (i = 0; i < NELEM(options); i++)
if (Flag(i) && options[i].name)
shprintf(" -o %s", options[i].name);
shprintf(newline);
}
}
char *
getoptions(void)
{
int i;
char m[(int) FNFLAGS + 1];
register char *cp = m;
for (i = 0; i < NELEM(options); i++)
if (options[i].c && Flag(i))
*cp++ = options[i].c;
*cp = 0;
return str_save(m, ATEMP);
}
/* change a Flag(*) value; takes care of special actions */
void
change_flag(enum sh_flag f, int what, int newval)
{
int oldval;
oldval = Flag(f);
Flag(f) = newval;
/* Turning off -p? */
if (f == FPRIVILEGED && oldval && !newval) {
setuid(ksheuid = getuid());
setgid(getgid());
} else if (f == FPOSIX && newval) {
#ifdef BRACE_EXPAND
Flag(FBRACEEXPAND) = 0
#endif /* BRACE_EXPAND */
;
}
/* Changing interactive flag? */
if (f == FTALKING) {
if ((what == OF_CMDLINE || what == OF_SET) && procpid == kshpid)
Flag(FTALKING_I) = newval;
} else if(f == FNOTTALKING) {
if ((what == OF_CMDLINE || what == OF_SET) && procpid == kshpid)
Flag(FTALKING_I) = !newval;
}
}
/* parse command line & set command arguments. returns the index of
* non-option arguments, -1 if there is an error.
*/
int
parse_args(char **argv, int what, int *setargsp)
{
static char cmd_opts[NELEM(options) + 3]; /* o:\0 */
static char set_opts[NELEM(options) + 5]; /* Ao;s\0 */
char *opts;
char *array = (char *) 0;
Getopt go;
int i, optc, set, sortargs = 0, arrayset = 0;
/* First call? Build option strings... */
if (cmd_opts[0] == '\0') {
char *p, *q;
strcpy(cmd_opts, "o:"); /* see cmd_opts[] declaration */
p = cmd_opts + strlen(cmd_opts);
strcpy(set_opts, "A:o;s"); /* see set_opts[] declaration */
q = set_opts + strlen(set_opts);
for (i = 0; i < NELEM(options); i++) {
if (options[i].c) {
if (options[i].flags & OF_CMDLINE)
*p++ = options[i].c;
if (options[i].flags & OF_SET)
*q++ = options[i].c;
}
}
*p = '\0';
*q = '\0';
}
if (what == OF_CMDLINE) {
char *p;
/* Set FLOGIN before parsing options so user can clear
* flag using +l.
*/
Flag(FLOGIN) = (argv[0][0] == '-'
|| ((p = ksh_strrchr_dirsep(argv[0]))
&& *++p == '-'));
opts = cmd_opts;
} else
opts = set_opts;
ksh_getopt_reset(&go, GF_ERROR|GF_PLUSOPT);
while ((optc = ksh_getopt(argv, &go, opts)) != EOF) {
set = (go.info & GI_PLUS) ? 0 : 1;
switch (optc) {
case 'A':
arrayset = set ? 1 : -1;
array = go.optarg;
break;
case 'o':
if (go.optarg == (char *) 0) {
/* lone -o: print options
*
* Note that on the command line, -o requires
* an option (ie, can't get here if what is
* OF_CMDLINE).
*/
printoptions(set);
break;
}
i = option(go.optarg);
if (i >= 0 && set == Flag(i))
/* Don't check the context if the flag
* isn't changing - makes "set -o interactive"
* work if you're already interactive. Needed
* if the output of "set +o" is to be used.
*/
;
else if (i >= 0 && (options[i].flags & what))
change_flag((enum sh_flag) i, what, set);
else {
bi_errorf("%s: bad option", go.optarg);
return -1;
}
break;
case '?':
return -1;
default:
/* -s: sort positional params (at&t ksh stupidity) */
if (what == OF_SET && optc == 's') {
sortargs = 1;
break;
}
for (i = 0; i < NELEM(options); i++)
if (optc == options[i].c
&& (what & options[i].flags))
{
change_flag((enum sh_flag) i, what,
set);
break;
}
if (i == NELEM(options)) {
internal_errorf(1, "parse_args: `%c'", optc);
return -1; /* not reached */
}
}
}
if (!(go.info & GI_MINUSMINUS) && argv[go.optind]
&& (argv[go.optind][0] == '-' || argv[go.optind][0] == '+')
&& argv[go.optind][1] == '\0')
{
/* lone - clears -v and -x flags */
if (argv[go.optind][0] == '-' && !Flag(FPOSIX))
Flag(FVERBOSE) = Flag(FXTRACE) = 0;
/* set skips lone - or + option */
go.optind++;
}
if (setargsp)
/* -- means set $#/$* even if there are no arguments */
*setargsp = !arrayset && ((go.info & GI_MINUSMINUS)
|| argv[go.optind]);
if (arrayset && (!*array || *skip_varname(array, FALSE))) {
bi_errorf("%s: is not an identifier", array);
return -1;
}
if (sortargs) {
for (i = go.optind; argv[i]; i++)
;
qsortp((void **) &argv[go.optind], (size_t) (i - go.optind),
xstrcmp);
}
if (arrayset) {
set_array(array, arrayset, argv + go.optind);
for (; argv[go.optind]; go.optind++)
;
}
return go.optind;
}
/* parse a decimal number: returns 0 if string isn't a number, 1 otherwise */
int
getn(const char *as, int *ai)
{
const char *s;
register int n;
int sawdigit = 0;
s = as;
if (*s == '-' || *s == '+')
s++;
for (n = 0; digit(*s); s++, sawdigit = 1)
n = n * 10 + (*s - '0');
*ai = (*as == '-') ? -n : n;
if (*s || !sawdigit)
return 0;
return 1;
}
/* getn() that prints error */
int
bi_getn(const char *as, int *ai)
{
int rv = getn(as, ai);
if (!rv)
bi_errorf("%s: bad number", as);
return rv;
}
/* -------- gmatch.c -------- */
/*
* int gmatch(string, pattern)
* char *string, *pattern;
*
* Match a pattern as in sh(1).
* pattern character are prefixed with MAGIC by expand.
*/
int
gmatch(char *s, char *p, int isfile)
{
const char *se, *pe;
if (s == NULL || p == NULL)
return 0;
se = s + strlen(s);
pe = p + strlen(p);
/* isfile is false iff no syntax check has been done on
* the pattern. If check fails, just to a strcmp().
*/
if (!isfile && !has_globbing(p, pe)) {
int len = pe - p + 1;
char tbuf[64];
char *t = len <= sizeof(tbuf) ? tbuf
: (char *) alloc(len, ATEMP);
debunk(t, p);
return !strcmp(t, s);
}
return do_gmatch((const unsigned char *) s, (const unsigned char *) se,
(const unsigned char *) p, (const unsigned char *) pe,
isfile);
}
/* Returns if p is a syntacticly correct globbing pattern, false
* if it contains no pattern characters or if there is a syntax error.
* Syntax errors are:
* - [ with no closing ]
* - imballenced $(...) expression
* - [...] and *(...) not nested (eg, [a$(b|]c), *(a[b|c]d))
*/
/*XXX
- if no magic,
if dest given, copy to dst
return ?
- if magic && (no globbing || syntax error)
debunk to dst
return ?
- return ?
*/
int
has_globbing(const char *xp, const char *xpe)
{
const unsigned char *p = (const unsigned char *) xp;
const unsigned char *pe = (const unsigned char *) xpe;
int c;
int nest = 0, bnest = 0;
int saw_glob = 0;
int in_bracket = 0; /* inside [...] */
for (; p < pe; p++) {
if (!ISMAGIC(*p))
continue;
if ((c = *++p) == '*' || c == '?')
saw_glob = 1;
else if (c == '[') {
if (!in_bracket) {
saw_glob = 1;
in_bracket = 1;
if (ISMAGIC(p[1]) && p[2] == NOT)
p += 2;
if (ISMAGIC(p[1]) && p[2] == ']')
p += 2;
}
/* XXX Do we need to check ranges here? POSIX Q */
} else if (c == ']') {
if (in_bracket) {
if (bnest) /* [a*(b]) */
return 0;
in_bracket = 0;
}
} else if ((c & 0x80) && strchr("*+?@! ", c & 0x7f)) {
saw_glob = 1;
if (in_bracket)
bnest++;
else
nest++;
} else if (c == '|') {
if (in_bracket && !bnest) /* *(a[foo|bar]) */
return 0;
} else if (c == /*(*/ ')') {
if (in_bracket) {
if (!bnest--) /* *(a[b)c] */
return 0;
} else if (nest)
nest--;
}
/* else must be a MAGIC-MAGIC, or MAGIC-!, MAGIC--, MAGIC-]
MAGIC-{, MAGIC-,, MAGIC-} */
}
return saw_glob && !in_bracket && !nest;
}
/* Function must return either 0 or 1 (assumed by code for 0x80|'!') */
static int
do_gmatch(unsigned char *s, unsigned char *se, const unsigned char *p, unsigned char *pe, int isfile)
{
register int sc, pc;
const unsigned char *prest, *psub, *pnext;
const unsigned char *srest;
if (s == NULL || p == NULL)
return 0;
while (p < pe) {
pc = *p++;
sc = s < se ? *s : '\0';
s++;
if (isfile) {
sc = FILECHCONV(sc);
pc = FILECHCONV(pc);
}
if (!ISMAGIC(pc)) {
if (sc != pc)
return 0;
continue;
}
switch (*p++) {
case '[':
if (sc == 0 || (p = cclass(p, sc)) == NULL)
return 0;
break;
case '?':
if (sc == 0)
return 0;
break;
case '*':
if (p == pe)
return 1;
s--;
do {
if (do_gmatch(s, se, p, pe, isfile))
return 1;
} while (s++ < se);
return 0;
/*
* [*+?@!](pattern|pattern|..)
*
* Not ifdef'd KSH as this is needed for ${..%..}, etc.
*/
case 0x80|'+': /* matches one or more times */
case 0x80|'*': /* matches zero or more times */
if (!(prest = pat_scan(p, pe, 0)))
return 0;
s--;
/* take care of zero matches */
if (p[-1] == (0x80 | '*')
&& do_gmatch(s, se, prest, pe, isfile))
return 1;
for (psub = p; ; psub = pnext) {
pnext = pat_scan(psub, pe, 1);
for (srest = s; srest <= se; srest++) {
if (do_gmatch(s, srest,
psub, pnext - 2, isfile)
&& (do_gmatch(srest, se,
prest, pe, isfile)
|| (s != srest
&& do_gmatch(srest, se,
p - 2, pe, isfile))))
return 1;
}
if (pnext == prest)
break;
}
return 0;
case 0x80|'?': /* matches zero or once */
case 0x80|'@': /* matches one of the patterns */
case 0x80|' ': /* simile for @ */
if (!(prest = pat_scan(p, pe, 0)))
return 0;
s--;
/* Take care of zero matches */
if (p[-1] == (0x80 | '?')
&& do_gmatch(s, se, prest, pe, isfile))
return 1;
for (psub = p; ; psub = pnext) {
pnext = pat_scan(psub, pe, 1);
srest = prest == pe ? se : s;
for (; srest <= se; srest++) {
if (do_gmatch(s, srest,
psub, pnext - 2, isfile)
&& do_gmatch(srest, se,
prest, pe, isfile))
return 1;
}
if (pnext == prest)
break;
}
return 0;
case 0x80|'!': /* matches none of the patterns */
if (!(prest = pat_scan(p, pe, 0)))
return 0;
s--;
for (srest = s; srest <= se; srest++) {
int matched = 0;
for (psub = p; ; psub = pnext) {
pnext = pat_scan(psub, pe, 1);
if (do_gmatch(s, srest,
psub, pnext - 2, isfile))
{
matched = 1;
break;
}
if (pnext == prest)
break;
}
if (!matched && do_gmatch(srest, se,
prest, pe, isfile))
return 1;
}
return 0;
default:
if (sc != p[-1])
return 0;
break;
}
}
return s == se;
}
static const unsigned char *
cclass(const unsigned char *p, register int sub)
{
register int c, d, not, found = 0;
const unsigned char *orig_p = p;
if ((not = (ISMAGIC(*p) && *++p == NOT)))
p++;
do {
c = *p++;
if (ISMAGIC(c)) {
c = *p++;
if ((c & 0x80) && !ISMAGIC(c)) {
c &= 0x7f;/* extended pattern matching: *+?@! */
/* XXX the ( char isn't handled as part of [] */
if (c == ' ') /* simile for @: plain (..) */
c = '(' /*)*/;
}
}
if (c == '\0')
/* No closing ] - act as if the opening [ was quoted */
return sub == '[' ? orig_p : NULL;
if (ISMAGIC(p[0]) && p[1] == '-'
&& (!ISMAGIC(p[2]) || p[3] != ']'))
{
p += 2; /* MAGIC- */
d = *p++;
if (ISMAGIC(d)) {
d = *p++;
if ((d & 0x80) && !ISMAGIC(d))
d &= 0x7f;
}
/* POSIX says this is an invalid expression */
if (c > d)
return NULL;
} else
d = c;
if (c == sub || (c <= sub && sub <= d))
found = 1;
} while (!(ISMAGIC(p[0]) && p[1] == ']'));
return (found != not) ? p+2 : NULL;
}
/* Look for next ) or | (if match_sep) in *(foo|bar) pattern */
const unsigned char *
pat_scan(const unsigned char *p, const unsigned char *pe, int match_sep)
{
int nest = 0;
for (; p < pe; p++) {
if (!ISMAGIC(*p))
continue;
if ((*++p == /*(*/ ')' && nest-- == 0)
|| (*p == '|' && match_sep && nest == 0))
return ++p;
if ((*p & 0x80) && strchr("*+?@! ", *p & 0x7f))
nest++;
}
return (const unsigned char *) 0;
}
/* -------- qsort.c -------- */
/*
* quick sort of array of generic pointers to objects.
*/
static void qsort1 ARGS((void **base, void **lim, int (*f)(void *, void *)));
void
qsortp(void **base, size_t n, int (*f) ARGS((void *, void *)))
{
qsort1(base, base + n, f);
}
#define swap2(a, b) {\
register void *t; t = *(a); *(a) = *(b); *(b) = t;\
}
#define swap3(a, b, c) {\
register void *t; t = *(a); *(a) = *(c); *(c) = *(b); *(b) = t;\
}
static void
qsort1(void **base, void **lim, int (*f) ARGS((void *, void *)))
{
register void **i, **j;
register void **lptr, **hptr;
size_t n;
int c;
top:
n = (lim - base) / 2;
if (n == 0)
return;
hptr = lptr = base+n;
i = base;
j = lim - 1;
for (;;) {
if (i < lptr) {
if ((c = (*f)(*i, *lptr)) == 0) {
lptr --;
swap2(i, lptr);
continue;
}
if (c < 0) {
i += 1;
continue;
}
}
begin:
if (j > hptr) {
if ((c = (*f)(*hptr, *j)) == 0) {
hptr ++;
swap2(hptr, j);
goto begin;
}
if (c > 0) {
if (i == lptr) {
hptr ++;
swap3(i, hptr, j);
i = lptr += 1;
goto begin;
}
swap2(i, j);
j -= 1;
i += 1;
continue;
}
j -= 1;
goto begin;
}
if (i == lptr) {
if (lptr-base >= lim-hptr) {
qsort1(hptr+1, lim, f);
lim = lptr;
} else {
qsort1(base, lptr, f);
base = hptr+1;
}
goto top;
}
lptr -= 1;
swap3(j, lptr, i);
j = hptr -= 1;
}
}
int
xstrcmp(void *p1, void *p2)
{
return (strcmp((char *)p1, (char *)p2));
}
/* Initialize a Getopt structure */
void
ksh_getopt_reset(Getopt *go, int flags)
{
go->optind = 1;
go->optarg = (char *) 0;
go->p = 0;
go->flags = flags;
go->info = 0;
go->buf[1] = '\0';
}
/* getopt() used for shell built-in commands, the getopts command, and
* command line options.
* A leading ':' in options means don't print errors, instead return '?'
* or ':' and set go->optarg to the offending option character.
* If GF_ERROR is set (and option doesn't start with :), errors result in
* a call to bi_errorf().
*
* Non-standard features:
* - ';' is like ':' in options, except the argument is optional
* (if it isn't present, optarg is set to 0).
* Used for 'set -o'.
* - ',' is like ':' in options, except the argument always immediately
* follows the option character (optarg is set to the null string if
* the option is missing).
* Used for 'read -u2', 'print -u2' and fc -40.
* - '#' is like ':' in options, expect that the argument is optional
* and must start with a digit. If the argument doesn't start with a
* digit, it is assumed to be missing and normal option processing
* continues (optarg is set to 0 if the option is missing).
* Used for 'typeset -LZ4'.
* - accepts +c as well as -c IF the GF_PLUSOPT flag is present. If an
* option starting with + is accepted, the GI_PLUS flag will be set
* in go->info.
*/
int
ksh_getopt(char **argv, Getopt *go, const char *options)
{
char c;
char *o;
if (go->p == 0 || (c = argv[go->optind - 1][go->p]) == '\0') {
char *arg = argv[go->optind], flag = arg ? *arg : '\0';
go->p = 1;
if (flag == '-' && arg[1] == '-' && arg[2] == '\0') {
go->optind++;
go->p = 0;
go->info |= GI_MINUSMINUS;
return EOF;
}
if (arg == (char *) 0
|| ((flag != '-' ) /* neither a - nor a + (if + allowed) */
&& (!(go->flags & GF_PLUSOPT) || flag != '+'))
|| (c = arg[1]) == '\0')
{
go->p = 0;
return EOF;
}
go->optind++;
go->info &= ~(GI_MINUS|GI_PLUS);
go->info |= flag == '-' ? GI_MINUS : GI_PLUS;
}
go->p++;
if (c == '?' || c == ':' || c == ';' || c == ',' || c == '#'
|| !(o = strchr(options, c)))
{
if (options[0] == ':') {
go->buf[0] = c;
go->optarg = go->buf;
} else {
warningf(TRUE, "%s%s-%c: unknown option",
(go->flags & GF_NONAME) ? "" : argv[0],
(go->flags & GF_NONAME) ? "" : ": ", c);
if (go->flags & GF_ERROR)
bi_errorf(null);
}
return '?';
}
/* : means argument must be present, may be part of option argument
* or the next argument
* ; same as : but argument may be missing
* , means argument is part of option argument, and may be null.
*/
if (*++o == ':' || *o == ';') {
if (argv[go->optind - 1][go->p])
go->optarg = argv[go->optind - 1] + go->p;
else if (argv[go->optind])
go->optarg = argv[go->optind++];
else if (*o == ';')
go->optarg = (char *) 0;
else {
if (options[0] == ':') {
go->buf[0] = c;
go->optarg = go->buf;
return ':';
}
warningf(TRUE, "%s%s-`%c' requires argument",
(go->flags & GF_NONAME) ? "" : argv[0],
(go->flags & GF_NONAME) ? "" : ": ", c);
if (go->flags & GF_ERROR)
bi_errorf(null);
return '?';
}
go->p = 0;
} else if (*o == ',') {
/* argument is attatched to option character, even if null */
go->optarg = argv[go->optind - 1] + go->p;
go->p = 0;
} else if (*o == '#') {
/* argument is optional and may be attatched or unattatched
* but must start with a digit. optarg is set to 0 if the
* argument is missing.
*/
if (argv[go->optind - 1][go->p]) {
if (digit(argv[go->optind - 1][go->p])) {
go->optarg = argv[go->optind - 1] + go->p;
go->p = 0;
} else
go->optarg = (char *) 0;;
} else {
if (argv[go->optind] && digit(argv[go->optind][0])) {
go->optarg = argv[go->optind++];
go->p = 0;
} else
go->optarg = (char *) 0;;
}
}
return c;
}
/* print variable/alias value using necessary quotes
* (POSIX says they should be suitable for re-entry...)
* No trailing newline is printed.
*/
void
print_value_quoted(const char *s)
{
const char *p;
int inquote = 0;
/* Test if any quotes are needed */
for (p = s; *p; p++)
if (ctype(*p, C_QUOTE))
break;
if (!*p) {
shprintf("%s", s);
return;
}
for (p = s; *p; p++) {
if (*p == '\'') {
shprintf("'\\'" + 1 - inquote);
inquote = 0;
} else {
if (!inquote) {
shprintf("'");
inquote = 1;
}
shf_putc(*p, shl_stdout);
}
}
if (inquote)
shprintf("'");
}
/* Print things in columns and rows - func() is called to format the ith
* element
*/
void
print_columns(struct shf *shf, int n, char *(*func) ARGS((void *, int, char *, int)), void *arg, int max_width)
{
char *str = (char *) alloc(max_width + 1, ATEMP);
int i;
int r, c;
int rows, cols;
int nspace;
/* max_width + 1 for the space. Note that no space
* is printed after the last column to avoid problems
* with terminals that have auto-wrap.
*/
cols = x_cols / (max_width + 1);
if (!cols)
cols = 1;
rows = (n + cols - 1) / cols;
if (n && cols > rows) {
int tmp = rows;
rows = cols;
cols = tmp;
if (rows > n)
rows = n;
}
nspace = (x_cols - max_width * cols) / cols;
if (nspace <= 0)
nspace = 1;
for (r = 0; r < rows; r++) {
for (c = 0; c < cols; c++) {
i = c * rows + r;
if (i < n) {
shf_fprintf(shf, "%-*s",
max_width,
(*func)(arg, i, str, max_width + 1));
if (c + 1 < cols)
shf_fprintf(shf, "%*s", nspace, null);
}
}
shf_putchar('\n', shf);
}
afree(str, ATEMP);
}
/* Strip any nul bytes from buf - returns new length (nbytes - # of nuls) */
int
strip_nuls(char *buf, int nbytes)
{
char *dst;
/* nbytes check because some systems (older freebsd's) have a buggy
* memchr()
*/
if (nbytes && (dst = memchr(buf, '\0', nbytes))) {
char *end = buf + nbytes;
char *p, *q;
for (p = dst; p < end; p = q) {
/* skip a block of nulls */
while (++p < end && *p == '\0')
;
/* find end of non-null block */
if (!(q = memchr(p, '\0', end - p)))
q = end;
memmove(dst, p, q - p);
dst += q - p;
}
*dst = '\0';
return dst - buf;
}
return nbytes;
}
/* Copy at most dsize-1 bytes from src to dst, ensuring dst is null terminated.
* Returns dst.
*/
char *
str_zcpy(char *dst, const char *src, int dsize)
{
if (dsize > 0) {
int len = strlen(src);
if (len >= dsize)
len = dsize - 1;
memcpy(dst, src, len);
dst[len] = '\0';
}
return dst;
}
/* Like read(2), but if read fails due to non-blocking flag, resets flag
* and restarts read.
*/
int
blocking_read(int fd, char *buf, int nbytes)
{
int ret;
int tried_reset = 0;
while ((ret = read(fd, buf, nbytes)) < 0) {
if (!tried_reset && (errno == EAGAIN
#ifdef EWOULDBLOCK
|| errno == EWOULDBLOCK
#endif /* EWOULDBLOCK */
))
{
int oerrno = errno;
if (reset_nonblock(fd) > 0) {
tried_reset = 1;
continue;
}
errno = oerrno;
}
break;
}
return ret;
}
/* Reset the non-blocking flag on the specified file descriptor.
* Returns -1 if there was an error, 0 if non-blocking wasn't set,
* 1 if it was.
*/
int
reset_nonblock(int fd)
{
int flags;
int blocking_flags;
if ((flags = fcntl(fd, F_GETFL, 0)) < 0)
return -1;
/* With luck, the C compiler will reduce this to a constant */
blocking_flags = 0;
#ifdef O_NONBLOCK
blocking_flags |= O_NONBLOCK;
#endif /* O_NONBLOCK */
#ifdef O_NDELAY
blocking_flags |= O_NDELAY;
#else /* O_NDELAY */
# ifndef O_NONBLOCK
blocking_flags |= FNDELAY; /* hope this exists... */
# endif /* O_NONBLOCK */
#endif /* O_NDELAY */
if (!(flags & blocking_flags))
return 0;
flags &= ~blocking_flags;
if (fcntl(fd, F_SETFL, flags) < 0)
return -1;
return 1;
}
#ifdef HAVE_SYS_PARAM_H
# include <sys/param.h>
#endif /* HAVE_SYS_PARAM_H */
#ifndef MAXPATHLEN
# define MAXPATHLEN PATH
#endif /* MAXPATHLEN */
#ifdef HPUX_GETWD_BUG
# include "ksh_dir.h"
/*
* Work around bug in hpux 10.x C library - getwd/getcwd dump core
* if current directory is not readable. Done in macro 'cause code
* is needed in GETWD and GETCWD cases.
*/
# define HPUX_GETWD_BUG_CODE \
{ \
DIR *d = ksh_opendir("."); \
if (!d) \
return (char *) 0; \
closedir(d); \
}
#else /* HPUX_GETWD_BUG */
# define HPUX_GETWD_BUG_CODE
#endif /* HPUX_GETWD_BUG */
/* Like getcwd(), except bsize is ignored if buf is 0 (MAXPATHLEN is used) */
char *
ksh_get_wd(char *buf, int bsize)
{
#ifdef HAVE_GETCWD
char *b;
char *ret;
/* Before memory allocated */
HPUX_GETWD_BUG_CODE
/* Assume getcwd() available */
if (!buf) {
bsize = MAXPATHLEN;
b = alloc(MAXPATHLEN + 1, ATEMP);
} else
b = buf;
ret = getcwd(b, bsize);
if (!buf) {
if (ret)
ret = aresize(b, strlen(b) + 1, ATEMP);
else
afree(b, ATEMP);
}
return ret;
#else /* HAVE_GETCWD */
extern char *getwd ARGS((char *));
char *b;
int len;
/* Before memory allocated */
HPUX_GETWD_BUG_CODE
if (buf && bsize > MAXPATHLEN)
b = buf;
else
b = alloc(MAXPATHLEN + 1, ATEMP);
if (!getwd(b)) {
errno = EACCES;
if (b != buf)
afree(b, ATEMP);
return (char *) 0;
}
len = strlen(b) + 1;
if (!buf)
b = aresize(b, len, ATEMP);
else if (buf != b) {
if (len > bsize) {
errno = ERANGE;
return (char *) 0;
}
memcpy(buf, b, len);
afree(b, ATEMP);
b = buf;
}
return b;
#endif /* HAVE_GETCWD */
}