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IABSD.fr/src/bin/ksh/misc.c
anton
- bin/ksh/misc.c
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/* $OpenBSD: misc.c,v 1.57 2017/07/04 11:46:15 anton Exp $ */ /* * Miscellaneous functions */ #include <ctype.h> #include <errno.h> #include <fcntl.h> #include <limits.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include "sh.h" #include "charclass.h" short ctypes [UCHAR_MAX+1]; /* type bits for unsigned char */ static int do_gmatch(const unsigned char *, const unsigned char *, const unsigned char *, const unsigned char *); static const unsigned char *cclass(const unsigned char *, int); /* * Fast character classes */ void setctypes(const char *s, int t) { 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) { 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(" \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(long unsigned int n, int base) { 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(const char *s, Area *ap) { size_t len; char *p; if (!s) return NULL; len = strlen(s)+1; p = alloc(len, ap); strlcpy(p, s, len); return (p); } /* 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(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 }, { NULL, 'c', OF_CMDLINE }, { "csh-history", 0, OF_ANY }, /* non-standard */ #ifdef EMACS { "emacs", 0, OF_ANY }, { "emacs-usemeta", 0, OF_ANY }, /* non-standard */ #endif { "errexit", 'e', OF_ANY }, #ifdef EMACS { "gmacs", 0, OF_ANY }, #endif { "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 */ { NULL, '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 }, { "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 }, { "sh", 0, OF_ANY }, /* non-standard */ { "stdin", 's', OF_CMDLINE }, /* pseudo non-standard */ { "trackall", 'h', OF_ANY }, { "verbose", 'v', OF_ANY }, #ifdef VI { "vi", 0, OF_ANY }, { "viraw", 0, OF_ANY }, /* no effect */ { "vi-show8", 0, OF_ANY }, /* non-standard */ { "vi-tabcomplete", 0, OF_ANY }, /* non-standard */ { "vi-esccomplete", 0, OF_ANY }, /* non-standard */ #endif { "xtrace", 'x', OF_ANY }, /* Anonymous flags: used internally by shell only * (not visible to user) */ { NULL, 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(void *arg, int i, char *buf, int buflen); static void printoptions(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, 1); } else { /* short version ala ksh93 */ shprintf("set"); for (i = 0; i < NELEM(options); i++) if (options[i].name) shprintf(" %co %s", Flag(i) ? '-' : '+', options[i].name); shprintf("\n"); } } char * getoptions(void) { int i; char m[(int) FNFLAGS + 1]; 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, /* flag to change */ int newval) /* what is changing the flag (command line vs set) */ { int oldval; oldval = Flag(f); Flag(f) = newval; #ifdef JOBS if (f == FMONITOR) { if (what != OF_CMDLINE && newval != oldval) j_change(); } else #endif /* JOBS */ #ifdef EDIT if (0 # ifdef VI || f == FVI # endif /* VI */ # ifdef EMACS || f == FEMACS || f == FGMACS # endif /* EMACS */ ) { if (newval) { # ifdef VI Flag(FVI) = 0; # endif /* VI */ # ifdef EMACS Flag(FEMACS) = Flag(FGMACS) = 0; # endif /* EMACS */ Flag(f) = newval; } } else #endif /* EDIT */ /* Turning off -p? */ if (f == FPRIVILEGED && oldval && !newval) { gid_t gid = getgid(); setresgid(gid, gid, gid); setgroups(1, &gid); setresuid(ksheuid, ksheuid, ksheuid); } 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; } } /* 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, /* OF_CMDLINE or OF_SET */ 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 = NULL; Getopt go; int i, optc, set, sortargs = 0, arrayset = 0; /* First call? Build option strings... */ if (cmd_opts[0] == '\0') { char *p, *q; /* see cmd_opts[] declaration */ strlcpy(cmd_opts, "o:", sizeof cmd_opts); p = cmd_opts + strlen(cmd_opts); /* see set_opts[] declaration */ strlcpy(set_opts, "A:o;s", sizeof set_opts); 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 = strrchr(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)) != -1) { set = (go.info & GI_PLUS) ? 0 : 1; switch (optc) { case 'A': arrayset = set ? 1 : -1; array = go.optarg; break; case 'o': if (go.optarg == NULL) { /* 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) { char *p; long n; n = strtol(as, &p, 10); if (!*as || *p || INT_MIN >= n || n >= INT_MAX) return 0; *ai = (int)n; 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(const char *s, const 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 : alloc(len, ATEMP); debunk(t, p, len); return !strcmp(t, s); } return do_gmatch((const unsigned char *) s, (const unsigned char *) se, (const unsigned char *) p, (const unsigned char *) pe); } /* 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 ] * - imbalanced $(...) expression * - [...] and *(...) not nested (eg, [a$(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] == '!') 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(const unsigned char *s, const unsigned char *se, const unsigned char *p, const unsigned char *pe) { 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 (!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)) 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)) 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) && (do_gmatch(srest, se, prest, pe) || (s != srest && do_gmatch(srest, se, p - 2, pe)))) 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)) 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) && do_gmatch(srest, se, prest, pe)) 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)) { matched = 1; break; } if (pnext == prest) break; } if (!matched && do_gmatch(srest, se, prest, pe)) return 1; } return 0; default: if (sc != p[-1]) return 0; break; } } return s == se; } static int posix_cclass(const unsigned char *pattern, int test, const unsigned char **ep) { struct cclass *cc; const unsigned char *colon; size_t len; int rval = 0; if ((colon = strchr(pattern, ':')) == NULL || colon[1] != MAGIC) { *ep = pattern - 2; return -1; } *ep = colon + 3; /* skip MAGIC */ len = (size_t)(colon - pattern); for (cc = cclasses; cc->name != NULL; cc++) { if (!strncmp(pattern, cc->name, len) && cc->name[len] == '\0') { if (cc->isctype(test)) rval = 1; break; } } if (cc->name == NULL) { rval = -2; /* invalid character class */ } return rval; } static const unsigned char * cclass(const unsigned char *p, int sub) { int c, d, rv, not, found = 0; const unsigned char *orig_p = p; if ((not = (ISMAGIC(*p) && *++p == '!'))) p++; do { /* check for POSIX character class (e.g. [[:alpha:]]) */ if ((p[0] == MAGIC && p[1] == '[' && p[2] == ':') || (p[0] == '[' && p[1] == ':')) { do { const char *pp = p + (*p == MAGIC) + 2; rv = posix_cclass(pp, sub, &p); switch (rv) { case 1: found = 1; break; case -2: return NULL; } } while (rv != -1 && p[0] == MAGIC && p[1] == '[' && p[2] == ':'); if (p[0] == MAGIC && p[1] == ']') break; } 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 NULL; } /* * quick sort of array of generic pointers to objects. */ void qsortp(void **base, /* base address */ size_t n, /* elements */ int (*f) (const void *, const void *)) /* compare function */ { qsort(base, n, sizeof(char *), f); } int xstrcmp(const void *p1, const 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 = NULL; 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 or be the string "unlimited". If the * argument doesn't match, 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' and 'ulimit -adunlimited'. * - 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 -1; } if (arg == NULL || ((flag != '-' ) && /* neither a - nor a + (if + allowed) */ (!(go->flags & GF_PLUSOPT) || flag != '+')) || (c = arg[1]) == '\0') { go->p = 0; return -1; } 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 = NULL; 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 attached 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 attached or unattached * 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]) || !strcmp(&argv[go->optind - 1][go->p], "unlimited")) { go->optarg = argv[go->optind - 1] + go->p; go->p = 0; } else go->optarg = NULL; } else { if (argv[go->optind] && (digit(argv[go->optind][0]) || !strcmp(argv[go->optind], "unlimited"))) { go->optarg = argv[go->optind++]; go->p = 0; } else go->optarg = NULL; } } 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(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) (void *, int, char *, int), void *arg, int max_width, int prefcol) { char *str = alloc(max_width + 1, ATEMP); int i; int r, c; int rows, cols; int nspace; int col_width; /* 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 (prefcol && n && cols > rows) { int tmp = rows; rows = cols; cols = tmp; if (rows > n) rows = n; } col_width = max_width; if (cols == 1) col_width = 0; /* Don't pad entries in single column output. */ 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", col_width, (*func)(arg, i, str, max_width + 1)); if (c + 1 < cols) shf_fprintf(shf, "%*s", nspace, ""); } } 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; if ((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; } /* 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) { 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; if ((flags = fcntl(fd, F_GETFL)) < 0) return -1; if (!(flags & O_NONBLOCK)) return 0; flags &= ~O_NONBLOCK; if (fcntl(fd, F_SETFL, flags) < 0) return -1; return 1; } /* Like getcwd(), except bsize is ignored if buf is 0 (PATH_MAX is used) */ char * ksh_get_wd(char *buf, int bsize) { char *b; char *ret; /* Note: we could just use plain getcwd(), but then we'd had to * inject possibly allocated space into the ATEMP area. */ /* Assume getcwd() available */ if (!buf) { bsize = PATH_MAX; b = alloc(PATH_MAX + 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; }