/* * Perform tilde expansion, placing the result in the stack string and * returning the next position in the input string to process. */ static const char * exptilde(const char *p, int flag) { char c; const char *startp = p; const char *user; struct passwd *pw; char *home; int len; for (;;) { c = *p; switch(c) { case CTLESC: /* This means CTL* are always considered quoted. */ case CTLVAR: case CTLBACKQ: case CTLBACKQ | CTLQUOTE: case CTLARI: case CTLENDARI: case CTLQUOTEMARK: return (startp); case ':': if ((flag & EXP_VARTILDE) == 0) break; /* FALLTHROUGH */ case '\0': case '/': case CTLENDVAR: len = p - startp - 1; STPUTBIN(startp + 1, len, expdest); STACKSTRNUL(expdest); user = expdest - len; if (*user == '\0') { home = lookupvar("HOME"); } else { pw = getpwnam(user); home = pw != NULL ? pw->pw_dir : NULL; } STADJUST(-len, expdest); if (home == NULL || *home == '\0') return (startp); strtodest(home, flag, VSNORMAL, 1, NULL); return (p); } p++; } }
/* * Perform tilde expansion, placing the result in the stack string and * returning the next position in the input string to process. */ static char * exptilde(char *p, int flag) { char c, *startp = p; struct passwd *pw; char *home; for (;;) { c = *p; switch(c) { case CTLESC: /* This means CTL* are always considered quoted. */ case CTLVAR: case CTLBACKQ: case CTLBACKQ | CTLQUOTE: case CTLARI: case CTLENDARI: case CTLQUOTEMARK: return (startp); case ':': if ((flag & EXP_VARTILDE) == 0) break; /* FALLTHROUGH */ case '\0': case '/': case CTLENDVAR: *p = '\0'; if (*(startp+1) == '\0') { home = lookupvar("HOME"); } else { pw = getpwnam(startp+1); home = pw != NULL ? pw->pw_dir : NULL; } *p = c; if (home == NULL || *home == '\0') return (startp); strtodest(home, flag, VSNORMAL, 1); return (p); } p++; } }
static void reprocess(int startloc, int flag, int subtype, int quoted, struct worddest *dst) { static char *buf = NULL; static size_t buflen = 0; char *startp; size_t len, zpos, zlen; startp = stackblock() + startloc; len = expdest - startp; if (len >= SIZE_MAX / 2) abort(); INTOFF; if (len >= buflen) { ckfree(buf); buf = NULL; } if (buflen < 128) buflen = 128; while (len >= buflen) buflen <<= 1; if (buf == NULL) buf = ckmalloc(buflen); INTON; memcpy(buf, startp, len); buf[len] = '\0'; STADJUST(-len, expdest); for (zpos = 0;;) { zlen = strlen(buf + zpos); strtodest(buf + zpos, flag, subtype, quoted, dst); zpos += zlen + 1; if (zpos == len + 1) break; if (flag & EXP_SPLIT && (quoted || (zlen > 0 && zpos < len))) NEXTWORD('\0', flag, expdest, dst); } }
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(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); }
static char * evalvar(char *p, int flag, struct worddest *dst) { int subtype; int varflags; char *var; const char *val; int patloc; int c; int set; int special; int startloc; int varlen; int varlenb; char buf[21]; 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) { if (p - var > (ptrdiff_t)sizeof(buf)) abort(); memcpy(buf, var, p - var - 1); buf[p - var - 1] = '\0'; strtodest(buf, flag, subtype, varflags & VSQUOTE, dst); } else varvalue(var, varflags & VSQUOTE, subtype, flag, dst); 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, dst); } } if (subtype == VSPLUS) set = ! set; switch (subtype) { case VSLENGTH: cvtnum(varlen, buf); strtodest(buf, flag, VSNORMAL, varflags & VSQUOTE, dst); break; case VSNORMAL: break; case VSPLUS: case VSMINUS: if (!set) { argstr(p, flag | (flag & EXP_SPLIT ? EXP_SPLIT_LIT : 0) | (varflags & VSQUOTE ? EXP_LIT_QUOTED : 0), dst); break; } 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(); subevalvar_trim(p, patloc, subtype, startloc); reprocess(startloc, flag, VSNORMAL, varflags & VSQUOTE, dst); if (flag & EXP_SPLIT && *var == '@' && varflags & VSQUOTE) dst->state = WORD_QUOTEMARK; break; case VSASSIGN: case VSQUESTION: if (!set) { if (subevalvar_misc(p, var, subtype, startloc, varflags)) { varflags &= ~VSNUL; goto again; } break; } break; case VSERROR: c = p - var - 1; error("${%.*s%s}: Bad substitution", c, var, (c > 0 && *p != CTLENDVAR) ? "..." : ""); default: abort(); } 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; }