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ash: implement ">&file" bashism. ~100 bytes.
This commit is contained in:
Denis Vlasenko
parent
93d0776a96
commit
559691a3bf
158
shell/ash.c
158
shell/ash.c
@ -8,7 +8,6 @@
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* Copyright (c) 1997-2005 Herbert Xu <herbert@gondor.apana.org.au>
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* was re-ported from NetBSD and debianized.
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*
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*
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* This code is derived from software contributed to Berkeley by
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* Kenneth Almquist.
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*
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@ -28,7 +27,6 @@
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* used in busybox and size optimizations,
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* rewrote arith (see notes to this), added locale support,
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* rewrote dynamic variables.
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*
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*/
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/*
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@ -247,8 +245,17 @@ extern struct globals_misc *const ash_ptr_to_globals_misc;
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} while (0)
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/* ============ Interrupts / exceptions */
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/* ============ Utility functions */
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static int isdigit_str9(const char *str)
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{
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int maxlen = 9 + 1; /* max 9 digits: 999999999 */
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while (--maxlen && isdigit(*str))
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str++;
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return (*str == '\0');
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}
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/* ============ Interrupts / exceptions */
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/*
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* These macros allow the user to suspend the handling of interrupt signals
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* over a period of time. This is similar to SIGHOLD or to sigblock, but
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@ -500,32 +507,35 @@ static const char dolatstr[] ALIGN1 = {
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CTLVAR, VSNORMAL|VSQUOTE, '@', '=', '\0'
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};
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#define NCMD 0
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#define NPIPE 1
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#define NREDIR 2
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#define NBACKGND 3
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#define NCMD 0
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#define NPIPE 1
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#define NREDIR 2
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#define NBACKGND 3
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#define NSUBSHELL 4
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#define NAND 5
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#define NOR 6
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#define NSEMI 7
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#define NIF 8
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#define NWHILE 9
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#define NUNTIL 10
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#define NFOR 11
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#define NCASE 12
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#define NCLIST 13
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#define NDEFUN 14
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#define NARG 15
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#define NTO 16
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#define NCLOBBER 17
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#define NFROM 18
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#define NFROMTO 19
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#define NAPPEND 20
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#define NTOFD 21
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#define NFROMFD 22
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#define NHERE 23
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#define NXHERE 24
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#define NNOT 25
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#define NAND 5
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#define NOR 6
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#define NSEMI 7
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#define NIF 8
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#define NWHILE 9
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#define NUNTIL 10
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#define NFOR 11
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#define NCASE 12
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#define NCLIST 13
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#define NDEFUN 14
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#define NARG 15
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#define NTO 16
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#if ENABLE_ASH_BASH_COMPAT
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#define NTO2 17
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#endif
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#define NCLOBBER 18
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#define NFROM 19
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#define NFROMTO 20
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#define NAPPEND 21
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#define NTOFD 22
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#define NFROMFD 23
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#define NHERE 24
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#define NXHERE 25
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#define NNOT 26
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union node;
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@ -588,20 +598,26 @@ struct narg {
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struct nodelist *backquote;
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};
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/* nfile and ndup layout must match!
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* NTOFD (>&fdnum) uses ndup structure, but we may discover mid-flight
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* that it is actually NTO2 (>&file), and change its type.
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*/
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struct nfile {
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smallint type;
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union node *next;
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int fd;
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int _unused_dupfd;
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union node *fname;
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char *expfname;
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};
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struct ndup {
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smallint type;
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union node *next; /* must match nfile's layout */
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int fd; /* must match nfile's layout */
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union node *next;
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int fd;
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int dupfd;
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union node *vname;
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char *_unused_expfname;
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};
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struct nhere {
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@ -904,8 +920,11 @@ shcmd(union node *cmd, FILE *fp)
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case NTO: s = ">>"+1; dftfd = 1; break;
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case NCLOBBER: s = ">|"; dftfd = 1; break;
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case NAPPEND: s = ">>"; dftfd = 1; break;
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#if ENABLE_ASH_BASH_COMPAT
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case NTO2:
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#endif
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case NTOFD: s = ">&"; dftfd = 1; break;
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case NFROM: s = "<"; break;
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case NFROM: s = "<"; break;
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case NFROMFD: s = "<&"; break;
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case NFROMTO: s = "<>"; break;
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default: s = "*error*"; break;
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@ -4408,6 +4427,9 @@ cmdtxt(union node *n)
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case NAPPEND:
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p = ">>";
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goto redir;
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#if ENABLE_ASH_BASH_COMPAT
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case NTO2:
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#endif
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case NTOFD:
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p = ">&";
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goto redir;
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@ -4797,6 +4819,9 @@ openredirect(union node *redir)
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goto ecreate;
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break;
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case NTO:
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#if ENABLE_ASH_BASH_COMPAT
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case NTO2:
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#endif
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/* Take care of noclobber mode. */
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if (Cflag) {
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fname = redir->nfile.expfname;
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@ -4959,6 +4984,10 @@ redirect(union node *redir, int flags)
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union node *tmp = redir;
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do {
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sv_pos++;
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#if ENABLE_ASH_BASH_COMPAT
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if (redir->nfile.type == NTO2)
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sv_pos++;
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#endif
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tmp = tmp->nfile.next;
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} while (tmp);
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sv = ckmalloc(sizeof(*sv) + sv_pos * sizeof(sv->two_fd[0]));
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@ -4997,6 +5026,9 @@ redirect(union node *redir, int flags)
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continue;
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}
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}
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#if ENABLE_ASH_BASH_COMPAT
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redirect_more:
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#endif
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if (need_to_remember(sv, fd)) {
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/* Copy old descriptor */
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i = fcntl(fd, F_DUPFD, 10);
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@ -5039,8 +5071,19 @@ redirect(union node *redir, int flags)
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}
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} else if (fd != newfd) { /* move newfd to fd */
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copyfd(newfd, fd | COPYFD_EXACT);
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close(newfd);
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#if ENABLE_ASH_BASH_COMPAT
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if (!(redir->nfile.type == NTO2 && fd == 2))
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#endif
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close(newfd);
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}
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#if ENABLE_ASH_BASH_COMPAT
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if (redir->nfile.type == NTO2 && fd == 1) {
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/* We already redirected it to fd 1, now copy it to 2 */
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newfd = 1;
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fd = 2;
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goto redirect_more;
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}
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#endif
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} while ((redir = redir->nfile.next) != NULL);
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INT_ON;
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@ -7641,6 +7684,9 @@ calcsize(union node *n)
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calcsize(n->narg.next);
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break;
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case NTO:
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#if ENABLE_ASH_BASH_COMPAT
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case NTO2:
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#endif
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case NCLOBBER:
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case NFROM:
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case NFROMTO:
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@ -7754,6 +7800,9 @@ copynode(union node *n)
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new->narg.next = copynode(n->narg.next);
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break;
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case NTO:
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#if ENABLE_ASH_BASH_COMPAT
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case NTO2:
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#endif
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case NCLOBBER:
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case NFROM:
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case NFROMTO:
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@ -8175,17 +8224,33 @@ expredir(union node *n)
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case NFROMTO:
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case NFROM:
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case NTO:
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#if ENABLE_ASH_BASH_COMPAT
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case NTO2:
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#endif
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case NCLOBBER:
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case NAPPEND:
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expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR);
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#if ENABLE_ASH_BASH_COMPAT
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store_expfname:
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#endif
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redir->nfile.expfname = fn.list->text;
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break;
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case NFROMFD:
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case NTOFD:
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case NTOFD: /* >& */
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if (redir->ndup.vname) {
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expandarg(redir->ndup.vname, &fn, EXP_FULL | EXP_TILDE);
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if (fn.list == NULL)
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ash_msg_and_raise_error("redir error");
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#if ENABLE_ASH_BASH_COMPAT
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//FIXME: we used expandarg with different args!
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if (!isdigit_str9(fn.list->text)) {
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/* >&file, not >&fd */
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if (redir->nfile.fd != 1) /* 123>&file - BAD */
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ash_msg_and_raise_error("redir error");
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redir->type = NTO2;
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goto store_expfname;
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}
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#endif
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fixredir(redir, fn.list->text, 1);
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}
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break;
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@ -10126,7 +10191,7 @@ fixredir(union node *n, const char *text, int err)
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n->ndup.dupfd = -1;
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else {
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if (err)
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raise_error_syntax("Bad fd number");
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raise_error_syntax("bad fd number");
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n->ndup.vname = makename();
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}
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}
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@ -10169,7 +10234,7 @@ parsefname(void)
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n->type = NXHERE;
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TRACE(("Here document %d\n", n->type));
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if (!noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN)
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raise_error_syntax("Illegal eof marker for << redirection");
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raise_error_syntax("illegal eof marker for << redirection");
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rmescapes(wordtext);
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here->eofmark = wordtext;
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here->next = NULL;
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@ -10261,7 +10326,7 @@ simplecmd(void)
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if (!goodname(name)
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|| ((bcmd = find_builtin(name)) && IS_BUILTIN_SPECIAL(bcmd))
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) {
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raise_error_syntax("Bad function name");
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raise_error_syntax("bad function name");
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}
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n->type = NDEFUN;
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checkkwd = CHKNL | CHKKWD | CHKALIAS;
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@ -10346,7 +10411,7 @@ parse_command(void)
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}
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case TFOR:
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if (readtoken() != TWORD || quoteflag || !goodname(wordtext))
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raise_error_syntax("Bad for loop variable");
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raise_error_syntax("bad for loop variable");
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n1 = stzalloc(sizeof(struct nfor));
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n1->type = NFOR;
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n1->nfor.var = wordtext;
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@ -10748,25 +10813,21 @@ readtoken1(int firstc, int syntax, char *eofmark, int striptabs)
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endword:
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#if ENABLE_ASH_MATH_SUPPORT
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if (syntax == ARISYNTAX)
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raise_error_syntax("Missing '))'");
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raise_error_syntax("missing '))'");
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#endif
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if (syntax != BASESYNTAX && !parsebackquote && eofmark == NULL)
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raise_error_syntax("Unterminated quoted string");
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raise_error_syntax("unterminated quoted string");
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if (varnest != 0) {
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startlinno = plinno;
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/* { */
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raise_error_syntax("Missing '}'");
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raise_error_syntax("missing '}'");
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}
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USTPUTC('\0', out);
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len = out - (char *)stackblock();
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out = stackblock();
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if (eofmark == NULL) {
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if ((c == '>' || c == '<') && quotef == 0) {
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int maxlen = 9 + 1; /* max 9 digit fd#: 999999999 */
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char *np = out;
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while (--maxlen && isdigit(*np))
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np++;
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if (*np == '\0') {
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if (isdigit_str9(out)) {
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PARSEREDIR(); /* passed as params: out, c */
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lasttoken = TREDIR;
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return lasttoken;
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@ -10841,6 +10902,7 @@ parseredir: {
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np->type = NCLOBBER;
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else if (c == '&')
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np->type = NTOFD;
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/* it also can be NTO2 (>&file), but we can't figure it out yet */
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else {
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np->type = NTO;
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pungetc();
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@ -10954,8 +11016,10 @@ parsesub: {
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} else if (is_special(c)) {
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USTPUTC(c, out);
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c = pgetc();
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} else
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badsub: raise_error_syntax("Bad substitution");
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} else {
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badsub:
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raise_error_syntax("bad substitution");
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}
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STPUTC('=', out);
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flags = 0;
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