ref: 9d09242bee8489b6cdee246489063488bb52b1fb
dir: /sys/src/ape/cmd/pdksh/io.c/
/*
* shell buffered IO and formatted output
*/
#include <ctype.h>
#include "sh.h"
#include "ksh_stat.h"
static int initio_done;
/*
* formatted output functions
*/
/* A shell error occured (eg, syntax error, etc.) */
void
#ifdef HAVE_PROTOTYPES
errorf(const char *fmt, ...)
#else
errorf(fmt, va_alist)
const char *fmt;
va_dcl
#endif
{
va_list va;
shl_stdout_ok = 0; /* debugging: note that stdout not valid */
exstat = 1;
if (*fmt) {
error_prefix(TRUE);
SH_VA_START(va, fmt);
shf_vfprintf(shl_out, fmt, va);
va_end(va);
shf_putchar('\n', shl_out);
}
shf_flush(shl_out);
unwind(LERROR);
}
/* like errorf(), but no unwind is done */
void
#ifdef HAVE_PROTOTYPES
warningf(int fileline, const char *fmt, ...)
#else
warningf(fileline, fmt, va_alist)
int fileline;
const char *fmt;
va_dcl
#endif
{
va_list va;
error_prefix(fileline);
SH_VA_START(va, fmt);
shf_vfprintf(shl_out, fmt, va);
va_end(va);
shf_putchar('\n', shl_out);
shf_flush(shl_out);
}
/* Used by built-in utilities to prefix shell and utility name to message
* (also unwinds environments for special builtins).
*/
void
#ifdef HAVE_PROTOTYPES
bi_errorf(const char *fmt, ...)
#else
bi_errorf(fmt, va_alist)
const char *fmt;
va_dcl
#endif
{
va_list va;
shl_stdout_ok = 0; /* debugging: note that stdout not valid */
exstat = 1;
if (*fmt) {
error_prefix(TRUE);
/* not set when main() calls parse_args() */
if (builtin_argv0)
shf_fprintf(shl_out, "%s: ", builtin_argv0);
SH_VA_START(va, fmt);
shf_vfprintf(shl_out, fmt, va);
va_end(va);
shf_putchar('\n', shl_out);
}
shf_flush(shl_out);
/* POSIX special builtins and ksh special builtins cause
* non-interactive shells to exit.
* XXX odd use of KEEPASN; also may not want LERROR here
*/
if ((builtin_flag & SPEC_BI)
|| (Flag(FPOSIX) && (builtin_flag & KEEPASN)))
{
builtin_argv0 = (char *) 0;
unwind(LERROR);
}
}
/* Called when something that shouldn't happen does */
void
#ifdef HAVE_PROTOTYPES
internal_errorf(int jump, const char *fmt, ...)
#else
internal_errorf(jump, fmt, va_alist)
int jump;
const char *fmt;
va_dcl
#endif
{
va_list va;
error_prefix(TRUE);
shf_fprintf(shl_out, "internal error: ");
SH_VA_START(va, fmt);
shf_vfprintf(shl_out, fmt, va);
va_end(va);
shf_putchar('\n', shl_out);
shf_flush(shl_out);
if (jump)
unwind(LERROR);
}
/* used by error reporting functions to print "ksh: .kshrc[25]: " */
void
error_prefix(int fileline)
{
/* Avoid foo: foo[2]: ... */
if (!fileline || !source || !source->file
|| strcmp(source->file, kshname) != 0)
shf_fprintf(shl_out, "%s: ", kshname + (*kshname == '-'));
if (fileline && source && source->file != NULL) {
shf_fprintf(shl_out, "%s[%d]: ", source->file,
source->errline > 0 ? source->errline : source->line);
source->errline = 0;
}
}
/* printf to shl_out (stderr) with flush */
void
#ifdef HAVE_PROTOTYPES
shellf(const char *fmt, ...)
#else
shellf(fmt, va_alist)
const char *fmt;
va_dcl
#endif
{
va_list va;
if (!initio_done) /* shl_out may not be set up yet... */
return;
SH_VA_START(va, fmt);
shf_vfprintf(shl_out, fmt, va);
va_end(va);
shf_flush(shl_out);
}
/* printf to shl_stdout (stdout) */
void
#ifdef HAVE_PROTOTYPES
shprintf(const char *fmt, ...)
#else
shprintf(fmt, va_alist)
const char *fmt;
va_dcl
#endif
{
va_list va;
if (!shl_stdout_ok)
internal_errorf(1, "shl_stdout not valid");
SH_VA_START(va, fmt);
shf_vfprintf(shl_stdout, fmt, va);
va_end(va);
}
#ifdef KSH_DEBUG
static struct shf *kshdebug_shf;
void
kshdebug_init_(void)
{
if (kshdebug_shf)
shf_close(kshdebug_shf);
kshdebug_shf = shf_open("/tmp/ksh-debug.log",
O_WRONLY|O_APPEND|O_CREAT, 0600,
SHF_WR|SHF_MAPHI);
if (kshdebug_shf) {
shf_fprintf(kshdebug_shf, "\nNew shell[pid %d]\n", getpid());
shf_flush(kshdebug_shf);
}
}
/* print to debugging log */
void
# ifdef HAVE_PROTOTYPES
kshdebug_printf_(const char *fmt, ...)
# else
kshdebug_printf_(fmt, va_alist)
const char *fmt;
va_dcl
# endif
{
va_list va;
if (!kshdebug_shf)
return;
SH_VA_START(va, fmt);
shf_fprintf(kshdebug_shf, "[%d] ", getpid());
shf_vfprintf(kshdebug_shf, fmt, va);
va_end(va);
shf_flush(kshdebug_shf);
}
void
kshdebug_dump_(const char *str, const void *mem, int nbytes)
{
int i, j;
int nprow = 16;
if (!kshdebug_shf)
return;
shf_fprintf(kshdebug_shf, "[%d] %s:\n", getpid(), str);
for (i = 0; i < nbytes; i += nprow) {
char c = '\t';
for (j = 0; j < nprow && i + j < nbytes; j++) {
shf_fprintf(kshdebug_shf, "%c%02x",
c, ((const unsigned char *) mem)[i + j]);
c = ' ';
}
shf_fprintf(kshdebug_shf, "\n");
}
shf_flush(kshdebug_shf);
}
#endif /* KSH_DEBUG */
/* test if we can seek backwards fd (returns 0 or SHF_UNBUF) */
int
can_seek(int fd)
{
struct stat statb;
return fstat(fd, &statb) == 0 && !S_ISREG(statb.st_mode) ?
SHF_UNBUF : 0;
}
struct shf shf_iob[3];
void
initio(void)
{
shf_fdopen(1, SHF_WR, shl_stdout); /* force buffer allocation */
shf_fdopen(2, SHF_WR, shl_out);
shf_fdopen(2, SHF_WR, shl_spare); /* force buffer allocation */
initio_done = 1;
kshdebug_init();
}
/* A dup2() with error checking */
int
ksh_dup2(int ofd, int nfd, int errok)
{
int ret = dup2(ofd, nfd);
if (ret < 0 && errno != EBADF && !errok)
errorf("too many files open in shell");
#ifdef DUP2_BROKEN
/* Ultrix systems like to preserve the close-on-exec flag */
if (ret >= 0)
(void) fcntl(nfd, F_SETFD, 0);
#endif /* DUP2_BROKEN */
return ret;
}
/*
* move fd from user space (0<=fd<10) to shell space (fd>=10),
* set close-on-exec flag.
*/
int
savefd(int fd, int noclose)
{
int nfd;
if (fd < FDBASE) {
nfd = ksh_dupbase(fd, FDBASE);
if (nfd < 0)
if (errno == EBADF)
return -1;
else
errorf("too many files open in shell");
if (!noclose)
close(fd);
} else
nfd = fd;
fd_clexec(nfd);
return nfd;
}
void
restfd(int fd, int ofd)
{
if (fd == 2)
shf_flush(&shf_iob[fd]);
if (ofd < 0) /* original fd closed */
close(fd);
else {
ksh_dup2(ofd, fd, TRUE); /* XXX: what to do if this fails? */
close(ofd);
}
}
void
openpipe(register int *pv)
{
if (pipe(pv) < 0)
errorf("can't create pipe - try again");
pv[0] = savefd(pv[0], 0);
pv[1] = savefd(pv[1], 0);
}
void
closepipe(register int *pv)
{
close(pv[0]);
close(pv[1]);
}
/* Called by iosetup() (deals with 2>&4, etc.), c_read, c_print to turn
* a string (the X in 2>&X, read -uX, print -uX) into a file descriptor.
*/
int
check_fd(char *name, int mode, const char **emsgp)
{
int fd, fl;
if (isdigit(name[0]) && !name[1]) {
fd = name[0] - '0';
if ((fl = fcntl(fd = name[0] - '0', F_GETFL, 0)) < 0) {
if (emsgp)
*emsgp = "bad file descriptor";
return -1;
}
fl &= O_ACCMODE;
#ifdef OS2
if (mode == W_OK ) {
if (setmode(fd, O_TEXT) == -1) {
if (emsgp)
*emsgp = "couldn't set write mode";
return -1;
}
} else if (mode == R_OK)
if (setmode(fd, O_BINARY) == -1) {
if (emsgp)
*emsgp = "couldn't set read mode";
return -1;
}
#else /* OS2 */
/* X_OK is a kludge to disable this check for dups (x<&1):
* historical shells never did this check (XXX don't know what
* posix has to say).
*/
if (!(mode & X_OK) && fl != O_RDWR
&& (((mode & R_OK) && fl != O_RDONLY)
|| ((mode & W_OK) && fl != O_WRONLY)))
{
if (emsgp)
*emsgp = (fl == O_WRONLY) ?
"fd not open for reading"
: "fd not open for writing";
return -1;
}
#endif /* OS2 */
return fd;
}
#ifdef KSH
else if (name[0] == 'p' && !name[1])
return coproc_getfd(mode, emsgp);
#endif /* KSH */
if (emsgp)
*emsgp = "illegal file descriptor name";
return -1;
}
#ifdef KSH
/* Called once from main */
void
coproc_init(void)
{
coproc.read = coproc.readw = coproc.write = -1;
coproc.njobs = 0;
coproc.id = 0;
}
/* Called by c_read() when eof is read - close fd if it is the co-process fd */
void
coproc_read_close(int fd)
{
if (coproc.read >= 0 && fd == coproc.read) {
coproc_readw_close(fd);
close(coproc.read);
coproc.read = -1;
}
}
/* Called by c_read() and by iosetup() to close the other side of the
* read pipe, so reads will actually terminate.
*/
void
coproc_readw_close(int fd)
{
if (coproc.readw >= 0 && coproc.read >= 0 && fd == coproc.read) {
close(coproc.readw);
coproc.readw = -1;
}
}
/* Called by c_print when a write to a fd fails with EPIPE and by iosetup
* when co-process input is dup'd
*/
void
coproc_write_close(int fd)
{
if (coproc.write >= 0 && fd == coproc.write) {
close(coproc.write);
coproc.write = -1;
}
}
/* Called to check for existance of/value of the co-process file descriptor.
* (Used by check_fd() and by c_read/c_print to deal with -p option).
*/
int
coproc_getfd(int mode, const char **emsgp)
{
int fd = (mode & R_OK) ? coproc.read : coproc.write;
if (fd >= 0)
return fd;
if (emsgp)
*emsgp = "no coprocess";
return -1;
}
/* called to close file descriptors related to the coprocess (if any)
* Should be called with SIGCHLD blocked.
*/
void
coproc_cleanup(int reuse)
{
/* This to allow co-processes to share output pipe */
if (!reuse || coproc.readw < 0 || coproc.read < 0) {
if (coproc.read >= 0) {
close(coproc.read);
coproc.read = -1;
}
if (coproc.readw >= 0) {
close(coproc.readw);
coproc.readw = -1;
}
}
if (coproc.write >= 0) {
close(coproc.write);
coproc.write = -1;
}
}
#endif /* KSH */
/*
* temporary files
*/
struct temp *
maketemp(Area *ap, Temp_type type, struct temp **tlist)
{
static unsigned int inc;
struct temp *tp;
int len;
int fd;
char *path;
const char *dir;
dir = tmpdir ? tmpdir : "/tmp";
/* The 20 + 20 is a paranoid worst case for pid/inc */
len = strlen(dir) + 3 + 20 + 20 + 1;
tp = (struct temp *) alloc(sizeof(struct temp) + len, ap);
tp->name = path = (char *) &tp[1];
tp->shf = (struct shf *) 0;
tp->type = type;
while (1) {
/* Note that temp files need to fit 8.3 DOS limits */
shf_snprintf(path, len, "%s/sh%05u.%03x",
dir, (unsigned) procpid, inc++);
/* Mode 0600 to be paranoid, O_TRUNC in case O_EXCL isn't
* really there.
*/
fd = open(path, O_RDWR|O_CREAT|O_EXCL|O_TRUNC, 0600);
if (fd >= 0) {
tp->shf = shf_fdopen(fd, SHF_WR, (struct shf *) 0);
break;
}
if (errno != EINTR
#ifdef EEXIST
&& errno != EEXIST
#endif /* EEXIST */
#ifdef EISDIR
&& errno != EISDIR
#endif /* EISDIR */
)
/* Error must be printed by caller: don't know here if
* errorf() or bi_errorf() should be used.
*/
break;
}
tp->next = NULL;
tp->pid = procpid;
tp->next = *tlist;
*tlist = tp;
return tp;
}