ref: 71ac88392f2033256b29f22bd8afdd7374100e5a
dir: /sys/src/ape/cmd/pdksh/shf.c/
/*
* Shell file I/O routines
*/
#include "sh.h"
#include "ksh_stat.h"
#include "ksh_limval.h"
/* flags to shf_emptybuf() */
#define EB_READSW 0x01 /* about to switch to reading */
#define EB_GROW 0x02 /* grow buffer if necessary (STRING+DYNAMIC) */
/*
* Replacement stdio routines. Stdio is too flakey on too many machines
* to be useful when you have multiple processes using the same underlying
* file descriptors.
*/
static int shf_fillbuf ARGS((struct shf *shf));
static int shf_emptybuf ARGS((struct shf *shf, int flags));
/* Open a file. First three args are for open(), last arg is flags for
* this package. Returns NULL if file could not be opened, or if a dup
* fails.
*/
struct shf *
shf_open(name, oflags, mode, sflags)
const char *name;
int oflags;
int mode;
int sflags;
{
struct shf *shf;
int bsize = sflags & SHF_UNBUF ? (sflags & SHF_RD ? 1 : 0) : SHF_BSIZE;
int fd;
/* Done before open so if alloca fails, fd won't be lost. */
shf = (struct shf *) alloc(sizeof(struct shf) + bsize, ATEMP);
shf->areap = ATEMP;
shf->buf = (unsigned char *) &shf[1];
shf->bsize = bsize;
shf->flags = SHF_ALLOCS;
/* Rest filled in by reopen. */
fd = open(name, oflags, mode);
if (fd < 0) {
afree(shf, shf->areap);
return NULL;
}
if ((sflags & SHF_MAPHI) && fd < FDBASE) {
int nfd;
nfd = ksh_dupbase(fd, FDBASE);
close(fd);
if (nfd < 0) {
afree(shf, shf->areap);
return NULL;
}
fd = nfd;
}
sflags &= ~SHF_ACCMODE;
sflags |= (oflags & O_ACCMODE) == O_RDONLY ? SHF_RD
: ((oflags & O_ACCMODE) == O_WRONLY ? SHF_WR
: SHF_RDWR);
return shf_reopen(fd, sflags, shf);
}
/* Set up the shf structure for a file descriptor. Doesn't fail. */
struct shf *
shf_fdopen(fd, sflags, shf)
int fd;
int sflags;
struct shf *shf;
{
int bsize = sflags & SHF_UNBUF ? (sflags & SHF_RD ? 1 : 0) : SHF_BSIZE;
/* use fcntl() to figure out correct read/write flags */
if (sflags & SHF_GETFL) {
int flags = fcntl(fd, F_GETFL, 0);
if (flags < 0)
/* will get an error on first read/write */
sflags |= SHF_RDWR;
else
switch (flags & O_ACCMODE) {
case O_RDONLY: sflags |= SHF_RD; break;
case O_WRONLY: sflags |= SHF_WR; break;
case O_RDWR: sflags |= SHF_RDWR; break;
}
}
if (!(sflags & (SHF_RD | SHF_WR)))
internal_errorf(1, "shf_fdopen: missing read/write");
if (shf) {
if (bsize) {
shf->buf = (unsigned char *) alloc(bsize, ATEMP);
sflags |= SHF_ALLOCB;
} else
shf->buf = (unsigned char *) 0;
} else {
shf = (struct shf *) alloc(sizeof(struct shf) + bsize, ATEMP);
shf->buf = (unsigned char *) &shf[1];
sflags |= SHF_ALLOCS;
}
shf->areap = ATEMP;
shf->fd = fd;
shf->rp = shf->wp = shf->buf;
shf->rnleft = 0;
shf->rbsize = bsize;
shf->wnleft = 0; /* force call to shf_emptybuf() */
shf->wbsize = sflags & SHF_UNBUF ? 0 : bsize;
shf->flags = sflags;
shf->errno_ = 0;
shf->bsize = bsize;
if (sflags & SHF_CLEXEC)
fd_clexec(fd);
return shf;
}
/* Set up an existing shf (and buffer) to use the given fd */
struct shf *
shf_reopen(fd, sflags, shf)
int fd;
int sflags;
struct shf *shf;
{
int bsize = sflags & SHF_UNBUF ? (sflags & SHF_RD ? 1 : 0) : SHF_BSIZE;
/* use fcntl() to figure out correct read/write flags */
if (sflags & SHF_GETFL) {
int flags = fcntl(fd, F_GETFL, 0);
if (flags < 0)
/* will get an error on first read/write */
sflags |= SHF_RDWR;
else
switch (flags & O_ACCMODE) {
case O_RDONLY: sflags |= SHF_RD; break;
case O_WRONLY: sflags |= SHF_WR; break;
case O_RDWR: sflags |= SHF_RDWR; break;
}
}
if (!(sflags & (SHF_RD | SHF_WR)))
internal_errorf(1, "shf_reopen: missing read/write");
if (!shf || !shf->buf || shf->bsize < bsize)
internal_errorf(1, "shf_reopen: bad shf/buf/bsize");
/* assumes shf->buf and shf->bsize already set up */
shf->fd = fd;
shf->rp = shf->wp = shf->buf;
shf->rnleft = 0;
shf->rbsize = bsize;
shf->wnleft = 0; /* force call to shf_emptybuf() */
shf->wbsize = sflags & SHF_UNBUF ? 0 : bsize;
shf->flags = (shf->flags & (SHF_ALLOCS | SHF_ALLOCB)) | sflags;
shf->errno_ = 0;
if (sflags & SHF_CLEXEC)
fd_clexec(fd);
return shf;
}
/* Open a string for reading or writing. If reading, bsize is the number
* of bytes that can be read. If writing, bsize is the maximum number of
* bytes that can be written. If shf is not null, it is filled in and
* returned, if it is null, shf is allocated. If writing and buf is null
* and SHF_DYNAMIC is set, the buffer is allocated (if bsize > 0, it is
* used for the initial size). Doesn't fail.
* When writing, a byte is reserved for a trailing null - see shf_sclose().
*/
struct shf *
shf_sopen(buf, bsize, sflags, shf)
char *buf;
int bsize;
int sflags;
struct shf *shf;
{
/* can't have a read+write string */
if (!(sflags & (SHF_RD | SHF_WR))
|| (sflags & (SHF_RD | SHF_WR)) == (SHF_RD | SHF_WR))
internal_errorf(1, "shf_sopen: flags 0x%x", sflags);
if (!shf) {
shf = (struct shf *) alloc(sizeof(struct shf), ATEMP);
sflags |= SHF_ALLOCS;
}
shf->areap = ATEMP;
if (!buf && (sflags & SHF_WR) && (sflags & SHF_DYNAMIC)) {
if (bsize <= 0)
bsize = 64;
sflags |= SHF_ALLOCB;
buf = alloc(bsize, shf->areap);
}
shf->fd = -1;
shf->buf = shf->rp = shf->wp = (unsigned char *) buf;
shf->rnleft = bsize;
shf->rbsize = bsize;
shf->wnleft = bsize - 1; /* space for a '\0' */
shf->wbsize = bsize;
shf->flags = sflags | SHF_STRING;
shf->errno_ = 0;
shf->bsize = bsize;
return shf;
}
/* Flush and close file descriptor, free the shf structure */
int
shf_close(shf)
struct shf *shf;
{
int ret = 0;
if (shf->fd >= 0) {
ret = shf_flush(shf);
if (close(shf->fd) < 0)
ret = EOF;
}
if (shf->flags & SHF_ALLOCS)
afree(shf, shf->areap);
else if (shf->flags & SHF_ALLOCB)
afree(shf->buf, shf->areap);
return ret;
}
/* Flush and close file descriptor, don't free file structure */
int
shf_fdclose(shf)
struct shf *shf;
{
int ret = 0;
if (shf->fd >= 0) {
ret = shf_flush(shf);
if (close(shf->fd) < 0)
ret = EOF;
shf->rnleft = 0;
shf->rp = shf->buf;
shf->wnleft = 0;
shf->fd = -1;
}
return ret;
}
/* Close a string - if it was opened for writing, it is null terminated;
* returns a pointer to the string and frees shf if it was allocated
* (does not free string if it was allocated).
*/
char *
shf_sclose(shf)
struct shf *shf;
{
unsigned char *s = shf->buf;
/* null terminate */
if (shf->flags & SHF_WR) {
shf->wnleft++;
shf_putc('\0', shf);
}
if (shf->flags & SHF_ALLOCS)
afree(shf, shf->areap);
return (char *) s;
}
/* Flush and free file structure, don't close file descriptor */
int
shf_finish(shf)
struct shf *shf;
{
int ret = 0;
if (shf->fd >= 0)
ret = shf_flush(shf);
if (shf->flags & SHF_ALLOCS)
afree(shf, shf->areap);
else if (shf->flags & SHF_ALLOCB)
afree(shf->buf, shf->areap);
return ret;
}
/* Un-read what has been read but not examined, or write what has been
* buffered. Returns 0 for success, EOF for (write) error.
*/
int
shf_flush(shf)
struct shf *shf;
{
if (shf->flags & SHF_STRING)
return (shf->flags & SHF_WR) ? EOF : 0;
if (shf->fd < 0)
internal_errorf(1, "shf_flush: no fd");
if (shf->flags & SHF_ERROR) {
errno = shf->errno_;
return EOF;
}
if (shf->flags & SHF_READING) {
shf->flags &= ~(SHF_EOF | SHF_READING);
if (shf->rnleft > 0) {
lseek(shf->fd, (off_t) -shf->rnleft, 1);
shf->rnleft = 0;
shf->rp = shf->buf;
}
return 0;
} else if (shf->flags & SHF_WRITING)
return shf_emptybuf(shf, 0);
return 0;
}
/* Write out any buffered data. If currently reading, flushes the read
* buffer. Returns 0 for success, EOF for (write) error.
*/
static int
shf_emptybuf(shf, flags)
struct shf *shf;
int flags;
{
int ret = 0;
if (!(shf->flags & SHF_STRING) && shf->fd < 0)
internal_errorf(1, "shf_emptybuf: no fd");
if (shf->flags & SHF_ERROR) {
errno = shf->errno_;
return EOF;
}
if (shf->flags & SHF_READING) {
if (flags & EB_READSW) /* doesn't happen */
return 0;
ret = shf_flush(shf);
shf->flags &= ~SHF_READING;
}
if (shf->flags & SHF_STRING) {
unsigned char *nbuf;
/* Note that we assume SHF_ALLOCS is not set if SHF_ALLOCB
* is set... (changing the shf pointer could cause problems)
*/
if (!(flags & EB_GROW) || !(shf->flags & SHF_DYNAMIC)
|| !(shf->flags & SHF_ALLOCB))
return EOF;
/* allocate more space for buffer */
nbuf = (unsigned char *) aresize(shf->buf, shf->wbsize * 2,
shf->areap);
shf->rp = nbuf + (shf->rp - shf->buf);
shf->wp = nbuf + (shf->wp - shf->buf);
shf->rbsize += shf->wbsize;
shf->wbsize += shf->wbsize;
shf->wnleft += shf->wbsize;
shf->wbsize *= 2;
shf->buf = nbuf;
} else {
if (shf->flags & SHF_WRITING) {
int ntowrite = shf->wp - shf->buf;
unsigned char *buf = shf->buf;
int n;
while (ntowrite > 0) {
n = write(shf->fd, buf, ntowrite);
if (n < 0) {
if (errno == EINTR
&& !(shf->flags & SHF_INTERRUPT))
continue;
shf->flags |= SHF_ERROR;
shf->errno_ = errno;
shf->wnleft = 0;
if (buf != shf->buf) {
/* allow a second flush
* to work */
memmove(shf->buf, buf,
ntowrite);
shf->wp = shf->buf + ntowrite;
}
return EOF;
}
buf += n;
ntowrite -= n;
}
if (flags & EB_READSW) {
shf->wp = shf->buf;
shf->wnleft = 0;
shf->flags &= ~SHF_WRITING;
return 0;
}
}
shf->wp = shf->buf;
shf->wnleft = shf->wbsize;
}
shf->flags |= SHF_WRITING;
return ret;
}
/* Fill up a read buffer. Returns EOF for a read error, 0 otherwise. */
static int
shf_fillbuf(shf)
struct shf *shf;
{
if (shf->flags & SHF_STRING)
return 0;
if (shf->fd < 0)
internal_errorf(1, "shf_fillbuf: no fd");
if (shf->flags & (SHF_EOF | SHF_ERROR)) {
if (shf->flags & SHF_ERROR)
errno = shf->errno_;
return EOF;
}
if ((shf->flags & SHF_WRITING) && shf_emptybuf(shf, EB_READSW) == EOF)
return EOF;
shf->flags |= SHF_READING;
shf->rp = shf->buf;
while (1) {
shf->rnleft = blocking_read(shf->fd, (char *) shf->buf,
shf->rbsize);
if (shf->rnleft < 0 && errno == EINTR
&& !(shf->flags & SHF_INTERRUPT))
continue;
break;
}
if (shf->rnleft <= 0) {
if (shf->rnleft < 0) {
shf->flags |= SHF_ERROR;
shf->errno_ = errno;
shf->rnleft = 0;
shf->rp = shf->buf;
return EOF;
}
shf->flags |= SHF_EOF;
}
return 0;
}
/* Seek to a new position in the file. If writing, flushes the buffer
* first. If reading, optimizes small relative seeks that stay inside the
* buffer. Returns 0 for success, EOF otherwise.
*/
int
shf_seek(shf, where, from)
struct shf *shf;
off_t where;
int from;
{
if (shf->fd < 0) {
errno = EINVAL;
return EOF;
}
if (shf->flags & SHF_ERROR) {
errno = shf->errno_;
return EOF;
}
if ((shf->flags & SHF_WRITING) && shf_emptybuf(shf, EB_READSW) == EOF)
return EOF;
if (shf->flags & SHF_READING) {
if (from == SEEK_CUR &&
(where < 0 ?
-where >= shf->rbsize - shf->rnleft :
where < shf->rnleft)) {
shf->rnleft -= where;
shf->rp += where;
return 0;
}
shf->rnleft = 0;
shf->rp = shf->buf;
}
shf->flags &= ~(SHF_EOF | SHF_READING | SHF_WRITING);
if (lseek(shf->fd, where, from) < 0) {
shf->errno_ = errno;
shf->flags |= SHF_ERROR;
return EOF;
}
return 0;
}
/* Read a buffer from shf. Returns the number of bytes read into buf,
* if no bytes were read, returns 0 if end of file was seen, EOF if
* a read error occurred.
*/
int
shf_read(buf, bsize, shf)
char *buf;
int bsize;
struct shf *shf;
{
int orig_bsize = bsize;
int ncopy;
if (!(shf->flags & SHF_RD))
internal_errorf(1, "shf_read: flags %x", shf->flags);
if (bsize <= 0)
internal_errorf(1, "shf_read: bsize %d", bsize);
while (bsize > 0) {
if (shf->rnleft == 0
&& (shf_fillbuf(shf) == EOF || shf->rnleft == 0))
break;
ncopy = shf->rnleft;
if (ncopy > bsize)
ncopy = bsize;
memcpy(buf, shf->rp, ncopy);
buf += ncopy;
bsize -= ncopy;
shf->rp += ncopy;
shf->rnleft -= ncopy;
}
/* Note: fread(3S) returns 0 for errors - this doesn't */
return orig_bsize == bsize ? (shf_error(shf) ? EOF : 0)
: orig_bsize - bsize;
}
/* Read up to a newline or EOF. The newline is put in buf; buf is always
* null terminated. Returns NULL on read error or if nothing was read before
* end of file, returns a pointer to the null byte in buf otherwise.
*/
char *
shf_getse(buf, bsize, shf)
char *buf;
int bsize;
struct shf *shf;
{
unsigned char *end;
int ncopy;
char *orig_buf = buf;
if (!(shf->flags & SHF_RD))
internal_errorf(1, "shf_getse: flags %x", shf->flags);
if (bsize <= 0)
return (char *) 0;
--bsize; /* save room for null */
do {
if (shf->rnleft == 0) {
if (shf_fillbuf(shf) == EOF)
return NULL;
if (shf->rnleft == 0) {
*buf = '\0';
return buf == orig_buf ? NULL : buf;
}
}
end = (unsigned char *) memchr((char *) shf->rp, '\n',
shf->rnleft);
ncopy = end ? end - shf->rp + 1 : shf->rnleft;
if (ncopy > bsize)
ncopy = bsize;
memcpy(buf, (char *) shf->rp, ncopy);
shf->rp += ncopy;
shf->rnleft -= ncopy;
buf += ncopy;
bsize -= ncopy;
#ifdef OS2
if (end && buf > orig_buf + 1 && buf[-2] == '\r') {
buf--;
bsize++;
buf[-1] = '\n';
}
#endif
} while (!end && bsize);
*buf = '\0';
return buf;
}
/* Returns the char read. Returns EOF for error and end of file. */
int
shf_getchar(shf)
struct shf *shf;
{
if (!(shf->flags & SHF_RD))
internal_errorf(1, "shf_getchar: flags %x", shf->flags);
if (shf->rnleft == 0 && (shf_fillbuf(shf) == EOF || shf->rnleft == 0))
return EOF;
--shf->rnleft;
return *shf->rp++;
}
/* Put a character back in the input stream. Returns the character if
* successful, EOF if there is no room.
*/
int
shf_ungetc(c, shf)
int c;
struct shf *shf;
{
if (!(shf->flags & SHF_RD))
internal_errorf(1, "shf_ungetc: flags %x", shf->flags);
if ((shf->flags & SHF_ERROR) || c == EOF
|| (shf->rp == shf->buf && shf->rnleft))
return EOF;
if ((shf->flags & SHF_WRITING) && shf_emptybuf(shf, EB_READSW) == EOF)
return EOF;
if (shf->rp == shf->buf)
shf->rp = shf->buf + shf->rbsize;
if (shf->flags & SHF_STRING) {
/* Can unget what was read, but not something different - we
* don't want to modify a string.
*/
if (shf->rp[-1] != c)
return EOF;
shf->flags &= ~SHF_EOF;
shf->rp--;
shf->rnleft++;
return c;
}
shf->flags &= ~SHF_EOF;
*--(shf->rp) = c;
shf->rnleft++;
return c;
}
/* Write a character. Returns the character if successful, EOF if
* the char could not be written.
*/
int
shf_putchar(c, shf)
int c;
struct shf *shf;
{
if (!(shf->flags & SHF_WR))
internal_errorf(1, "shf_putchar: flags %x", shf->flags);
if (c == EOF)
return EOF;
if (shf->flags & SHF_UNBUF) {
char cc = c;
int n;
if (shf->fd < 0)
internal_errorf(1, "shf_putchar: no fd");
if (shf->flags & SHF_ERROR) {
errno = shf->errno_;
return EOF;
}
while ((n = write(shf->fd, &cc, 1)) != 1)
if (n < 0) {
if (errno == EINTR
&& !(shf->flags & SHF_INTERRUPT))
continue;
shf->flags |= SHF_ERROR;
shf->errno_ = errno;
return EOF;
}
} else {
/* Flush deals with strings and sticky errors */
if (shf->wnleft == 0 && shf_emptybuf(shf, EB_GROW) == EOF)
return EOF;
shf->wnleft--;
*shf->wp++ = c;
}
return c;
}
/* Write a string. Returns the length of the string if successful, EOF if
* the string could not be written.
*/
int
shf_puts(s, shf)
const char *s;
struct shf *shf;
{
if (!s)
return EOF;
return shf_write(s, strlen(s), shf);
}
/* Write a buffer. Returns nbytes if successful, EOF if there is an error. */
int
shf_write(buf, nbytes, shf)
const char *buf;
int nbytes;
struct shf *shf;
{
int orig_nbytes = nbytes;
int n;
int ncopy;
if (!(shf->flags & SHF_WR))
internal_errorf(1, "shf_write: flags %x", shf->flags);
if (nbytes < 0)
internal_errorf(1, "shf_write: nbytes %d", nbytes);
/* Don't buffer if buffer is empty and we're writting a large amount. */
if ((ncopy = shf->wnleft)
&& (shf->wp != shf->buf || nbytes < shf->wnleft))
{
if (ncopy > nbytes)
ncopy = nbytes;
memcpy(shf->wp, buf, ncopy);
nbytes -= ncopy;
buf += ncopy;
shf->wp += ncopy;
shf->wnleft -= ncopy;
}
if (nbytes > 0) {
/* Flush deals with strings and sticky errors */
if (shf_emptybuf(shf, EB_GROW) == EOF)
return EOF;
if (nbytes > shf->wbsize) {
ncopy = nbytes;
if (shf->wbsize)
ncopy -= nbytes % shf->wbsize;
nbytes -= ncopy;
while (ncopy > 0) {
n = write(shf->fd, buf, ncopy);
if (n < 0) {
if (errno == EINTR
&& !(shf->flags & SHF_INTERRUPT))
continue;
shf->flags |= SHF_ERROR;
shf->errno_ = errno;
shf->wnleft = 0;
/* Note: fwrite(3S) returns 0 for
* errors - this doesn't */
return EOF;
}
buf += n;
ncopy -= n;
}
}
if (nbytes > 0) {
memcpy(shf->wp, buf, nbytes);
shf->wp += nbytes;
shf->wnleft -= nbytes;
}
}
return orig_nbytes;
}
int
#ifdef HAVE_PROTOTYPES
shf_fprintf(struct shf *shf, const char *fmt, ...)
#else
shf_fprintf(shf, fmt, va_alist)
struct shf *shf;
const char *fmt;
va_dcl
#endif
{
va_list args;
int n;
SH_VA_START(args, fmt);
n = shf_vfprintf(shf, fmt, args);
va_end(args);
return n;
}
int
#ifdef HAVE_PROTOTYPES
shf_snprintf(char *buf, int bsize, const char *fmt, ...)
#else
shf_snprintf(buf, bsize, fmt, va_alist)
char *buf;
int bsize;
const char *fmt;
va_dcl
#endif
{
struct shf shf;
va_list args;
int n;
if (!buf || bsize <= 0)
internal_errorf(1, "shf_snprintf: buf %lx, bsize %d",
(long) buf, bsize);
shf_sopen(buf, bsize, SHF_WR, &shf);
SH_VA_START(args, fmt);
n = shf_vfprintf(&shf, fmt, args);
va_end(args);
shf_sclose(&shf); /* null terminates */
return n;
}
char *
#ifdef HAVE_PROTOTYPES
shf_smprintf(const char *fmt, ...)
#else
shf_smprintf(fmt, va_alist)
char *fmt;
va_dcl
#endif
{
struct shf shf;
va_list args;
shf_sopen((char *) 0, 0, SHF_WR|SHF_DYNAMIC, &shf);
SH_VA_START(args, fmt);
shf_vfprintf(&shf, fmt, args);
va_end(args);
return shf_sclose(&shf); /* null terminates */
}
#undef FP /* if you want floating point stuff */
#define BUF_SIZE 128
#define FPBUF_SIZE (DMAXEXP+16)/* this must be >
* MAX(DMAXEXP, log10(pow(2, DSIGNIF)))
* + ceil(log10(DMAXEXP)) + 8 (I think).
* Since this is hard to express as a
* constant, just use a large buffer.
*/
/*
* What kinda of machine we on? Hopefully the C compiler will optimize
* this out...
*
* For shorts, we want sign extend for %d but not for %[oxu] - on 16 bit
* machines it don't matter. Assmumes C compiler has converted shorts to
* ints before pushing them.
*/
#define POP_INT(f, s, a) (((f) & FL_LONG) ? \
va_arg((a), unsigned long) \
: \
(sizeof(int) < sizeof(long) ? \
((s) ? \
(long) va_arg((a), int) \
: \
va_arg((a), unsigned)) \
: \
va_arg((a), unsigned)))
#define ABIGNUM 32000 /* big numer that will fit in a short */
#define LOG2_10 3.321928094887362347870319429 /* log base 2 of 10 */
#define FL_HASH 0x001 /* `#' seen */
#define FL_PLUS 0x002 /* `+' seen */
#define FL_RIGHT 0x004 /* `-' seen */
#define FL_BLANK 0x008 /* ` ' seen */
#define FL_SHORT 0x010 /* `h' seen */
#define FL_LONG 0x020 /* `l' seen */
#define FL_ZERO 0x040 /* `0' seen */
#define FL_DOT 0x080 /* '.' seen */
#define FL_UPPER 0x100 /* format character was uppercase */
#define FL_NUMBER 0x200 /* a number was formated %[douxefg] */
#ifdef FP
#include <math.h>
static double
my_ceil(d)
double d;
{
double i;
return d - modf(d, &i) + (d < 0 ? -1 : 1);
}
#endif /* FP */
int
shf_vfprintf(shf, fmt, args)
struct shf *shf;
const char *fmt;
va_list args;
{
char c, *s;
int UNINITIALIZED(tmp);
int field, precision;
int len;
int flags;
unsigned long lnum;
/* %#o produces the longest output */
char numbuf[(BITS(long) + 2) / 3 + 1];
/* this stuff for dealing with the buffer */
int nwritten = 0;
#ifdef FP
/* should be in <math.h>
* extern double frexp();
*/
extern char *ecvt();
double fpnum;
int expo, decpt;
char style;
char fpbuf[FPBUF_SIZE];
#endif /* FP */
if (!fmt)
return 0;
while ((c = *fmt++)) {
if (c != '%') {
shf_putc(c, shf);
nwritten++;
continue;
}
/*
* This will accept flags/fields in any order - not
* just the order specified in printf(3), but this is
* the way _doprnt() seems to work (on bsd and sysV).
* The only resriction is that the format character must
* come last :-).
*/
flags = field = precision = 0;
for ( ; (c = *fmt++) ; ) {
switch (c) {
case '#':
flags |= FL_HASH;
continue;
case '+':
flags |= FL_PLUS;
continue;
case '-':
flags |= FL_RIGHT;
continue;
case ' ':
flags |= FL_BLANK;
continue;
case '0':
if (!(flags & FL_DOT))
flags |= FL_ZERO;
continue;
case '.':
flags |= FL_DOT;
precision = 0;
continue;
case '*':
tmp = va_arg(args, int);
if (flags & FL_DOT)
precision = tmp;
else if ((field = tmp) < 0) {
field = -field;
flags |= FL_RIGHT;
}
continue;
case 'l':
flags |= FL_LONG;
continue;
case 'h':
flags |= FL_SHORT;
continue;
}
if (digit(c)) {
tmp = c - '0';
while (c = *fmt++, digit(c))
tmp = tmp * 10 + c - '0';
--fmt;
if (tmp < 0) /* overflow? */
tmp = 0;
if (flags & FL_DOT)
precision = tmp;
else
field = tmp;
continue;
}
break;
}
if (precision < 0)
precision = 0;
if (!c) /* nasty format */
break;
if (c >= 'A' && c <= 'Z') {
flags |= FL_UPPER;
c = c - 'A' + 'a';
}
switch (c) {
case 'p': /* pointer */
flags &= ~(FL_LONG | FL_SHORT);
if (sizeof(char *) > sizeof(int))
flags |= FL_LONG; /* hope it fits.. */
/* aaahhh... */
case 'd':
case 'i':
case 'o':
case 'u':
case 'x':
flags |= FL_NUMBER;
s = &numbuf[sizeof(numbuf)];
lnum = POP_INT(flags, c == 'd', args);
switch (c) {
case 'd':
case 'i':
if (0 > (long) lnum)
lnum = - (long) lnum, tmp = 1;
else
tmp = 0;
/* aaahhhh..... */
case 'u':
do {
*--s = lnum % 10 + '0';
lnum /= 10;
} while (lnum);
if (c != 'u') {
if (tmp)
*--s = '-';
else if (flags & FL_PLUS)
*--s = '+';
else if (flags & FL_BLANK)
*--s = ' ';
}
break;
case 'o':
do {
*--s = (lnum & 0x7) + '0';
lnum >>= 3;
} while (lnum);
if ((flags & FL_HASH) && *s != '0')
*--s = '0';
break;
case 'p':
case 'x':
{
const char *digits = (flags & FL_UPPER) ?
"0123456789ABCDEF"
: "0123456789abcdef";
do {
*--s = digits[lnum & 0xf];
lnum >>= 4;
} while (lnum);
if (flags & FL_HASH) {
*--s = (flags & FL_UPPER) ? 'X' : 'x';
*--s = '0';
}
}
}
len = &numbuf[sizeof(numbuf)] - s;
if (flags & FL_DOT) {
if (precision > len) {
field = precision;
flags |= FL_ZERO;
} else
precision = len; /* no loss */
}
break;
#ifdef FP
case 'e':
case 'g':
case 'f':
{
char *p;
/*
* This could proabably be done better,
* but it seems to work. Note that gcvt()
* is not used, as you cannot tell it to
* not strip the zeros.
*/
flags |= FL_NUMBER;
if (!(flags & FL_DOT))
precision = 6; /* default */
/*
* Assumes doubles are pushed on
* the stack. If this is not so, then
* FL_LONG/FL_SHORT should be checked.
*/
fpnum = va_arg(args, double);
s = fpbuf;
style = c;
/*
* This is the same as
* expo = ceil(log10(fpnum))
* but doesn't need -lm. This is an
* aproximation as expo is rounded up.
*/
(void) frexp(fpnum, &expo);
expo = my_ceil(expo / LOG2_10);
if (expo < 0)
expo = 0;
p = ecvt(fpnum, precision + 1 + expo,
&decpt, &tmp);
if (c == 'g') {
if (decpt < -4 || decpt > precision)
style = 'e';
else
style = 'f';
if (decpt > 0 && (precision -= decpt) < 0)
precision = 0;
}
if (tmp)
*s++ = '-';
else if (flags & FL_PLUS)
*s++ = '+';
else if (flags & FL_BLANK)
*s++ = ' ';
if (style == 'e')
*s++ = *p++;
else {
if (decpt > 0) {
/* Overflow check - should
* never have this problem.
*/
if (decpt >
&fpbuf[sizeof(fpbuf)]
- s - 8)
decpt =
&fpbuf[sizeof(fpbuf)]
- s - 8;
(void) memcpy(s, p, decpt);
s += decpt;
p += decpt;
} else
*s++ = '0';
}
/* print the fraction? */
if (precision > 0) {
*s++ = '.';
/* Overflow check - should
* never have this problem.
*/
if (precision > &fpbuf[sizeof(fpbuf)]
- s - 7)
precision =
&fpbuf[sizeof(fpbuf)]
- s - 7;
for (tmp = decpt; tmp++ < 0 &&
precision > 0 ; precision--)
*s++ = '0';
tmp = strlen(p);
if (precision > tmp)
precision = tmp;
/* Overflow check - should
* never have this problem.
*/
if (precision > &fpbuf[sizeof(fpbuf)]
- s - 7)
precision =
&fpbuf[sizeof(fpbuf)]
- s - 7;
(void) memcpy(s, p, precision);
s += precision;
/*
* `g' format strips trailing
* zeros after the decimal.
*/
if (c == 'g' && !(flags & FL_HASH)) {
while (*--s == '0')
;
if (*s != '.')
s++;
}
} else if (flags & FL_HASH)
*s++ = '.';
if (style == 'e') {
*s++ = (flags & FL_UPPER) ? 'E' : 'e';
if (--decpt >= 0)
*s++ = '+';
else {
*s++ = '-';
decpt = -decpt;
}
p = &numbuf[sizeof(numbuf)];
for (tmp = 0; tmp < 2 || decpt ; tmp++) {
*--p = '0' + decpt % 10;
decpt /= 10;
}
tmp = &numbuf[sizeof(numbuf)] - p;
(void) memcpy(s, p, tmp);
s += tmp;
}
len = s - fpbuf;
s = fpbuf;
precision = len;
break;
}
#endif /* FP */
case 's':
if (!(s = va_arg(args, char *)))
s = "(null %s)";
len = strlen(s);
break;
case 'c':
flags &= ~FL_DOT;
numbuf[0] = va_arg(args, int);
s = numbuf;
len = 1;
break;
case '%':
default:
numbuf[0] = c;
s = numbuf;
len = 1;
break;
}
/*
* At this point s should point to a string that is
* to be formatted, and len should be the length of the
* string.
*/
if (!(flags & FL_DOT) || len < precision)
precision = len;
if (field > precision) {
field -= precision;
if (!(flags & FL_RIGHT)) {
field = -field;
/* skip past sign or 0x when padding with 0 */
if ((flags & FL_ZERO) && (flags & FL_NUMBER)) {
if (*s == '+' || *s == '-' || *s ==' ')
{
shf_putc(*s, shf);
s++;
precision--;
nwritten++;
} else if (*s == '0') {
shf_putc(*s, shf);
s++;
nwritten++;
if (--precision > 0 &&
(*s | 0x20) == 'x')
{
shf_putc(*s, shf);
s++;
precision--;
nwritten++;
}
}
c = '0';
} else
c = flags & FL_ZERO ? '0' : ' ';
if (field < 0) {
nwritten += -field;
for ( ; field < 0 ; field++)
shf_putc(c, shf);
}
} else
c = ' ';
} else
field = 0;
if (precision > 0) {
nwritten += precision;
for ( ; precision-- > 0 ; s++)
shf_putc(*s, shf);
}
if (field > 0) {
nwritten += field;
for ( ; field > 0 ; --field)
shf_putc(c, shf);
}
}
return shf_error(shf) ? EOF : nwritten;
}