forked from MirBSD/mksh
/
shf.c
1987 lines (1826 loc) · 48.1 KB
/
shf.c
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/* $OpenBSD: shf.c,v 1.16 2013/04/19 17:36:09 millert Exp $ */
/*-
* Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2011,
* 2012, 2013, 2015, 2016, 2017, 2018, 2019, 2021
* mirabilos <m@mirbsd.org>
* Copyright (c) 2015
* Daniel Richard G. <skunk@iSKUNK.ORG>
*
* Provided that these terms and disclaimer and all copyright notices
* are retained or reproduced in an accompanying document, permission
* is granted to deal in this work without restriction, including un-
* limited rights to use, publicly perform, distribute, sell, modify,
* merge, give away, or sublicence.
*
* This work is provided "AS IS" and WITHOUT WARRANTY of any kind, to
* the utmost extent permitted by applicable law, neither express nor
* implied; without malicious intent or gross negligence. In no event
* may a licensor, author or contributor be held liable for indirect,
* direct, other damage, loss, or other issues arising in any way out
* of dealing in the work, even if advised of the possibility of such
* damage or existence of a defect, except proven that it results out
* of said person's immediate fault when using the work as intended.
*-
* Use %zX instead of %p and floating point isn't supported at all.
*/
#include "sh.h"
__RCSID("$MirOS: src/bin/mksh/shf.c,v 1.120 2021/10/01 23:25:35 tg Exp $");
/* 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(struct shf *);
static int shf_emptybuf(struct shf *, int);
/*
* 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(const char *name, int oflags, int mode, int sflags)
{
struct shf *shf;
ssize_t bsize =
/* at most 512 */
sflags & SHF_UNBUF ? (sflags & SHF_RD ? 1 : 0) : SHF_BSIZE;
int fd, eno;
/* Done before open so if alloca fails, fd won't be lost. */
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 = binopen3(name, oflags, mode);
if (fd < 0) {
eno = errno;
afree(shf, shf->areap);
errno = eno;
return (NULL);
}
if ((sflags & SHF_MAPHI) && fd < FDBASE) {
int nfd;
nfd = fcntl(fd, F_DUPFD, FDBASE);
eno = errno;
close(fd);
if (nfd < 0) {
afree(shf, shf->areap);
errno = eno;
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));
}
/* helper function for shf_fdopen and shf_reopen */
static void
shf_open_hlp(int fd, int *sflagsp, const char *where)
{
int sflags = *sflagsp;
/* 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;
}
}
*sflagsp = sflags;
}
if (!(sflags & (SHF_RD | SHF_WR)))
internal_errorf(Tbad_flags, where, sflags);
}
/* Set up the shf structure for a file descriptor. Doesn't fail. */
struct shf *
shf_fdopen(int fd, int sflags, struct shf *shf)
{
ssize_t bsize =
/* at most 512 */
sflags & SHF_UNBUF ? (sflags & SHF_RD ? 1 : 0) : SHF_BSIZE;
shf_open_hlp(fd, &sflags, "shf_fdopen");
if (shf) {
if (bsize) {
shf->buf = alloc(bsize, ATEMP);
sflags |= SHF_ALLOCB;
} else
shf->buf = NULL;
} else {
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->errnosv = 0;
shf->bsize = bsize;
if ((sflags & SHF_CLEXEC) && fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
internal_warningf(Tcloexec_failed, "set", fd,
cstrerror(errno));
return (shf);
}
/* Set up an existing shf (and buffer) to use the given fd */
struct shf *
shf_reopen(int fd, int sflags, struct shf *shf)
{
ssize_t bsize =
/* at most 512 */
sflags & SHF_UNBUF ? (sflags & SHF_RD ? 1 : 0) : SHF_BSIZE;
shf_open_hlp(fd, &sflags, "shf_reopen");
if (!shf->buf || shf->bsize < bsize)
internal_errorf(Tbad_buf, "shf_reopen",
(size_t)shf->buf, shf->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->errnosv = 0;
if ((sflags & SHF_CLEXEC) && fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
internal_warningf(Tcloexec_failed, "set", fd,
cstrerror(errno));
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 NUL - see shf_sclose().
*/
struct shf *
shf_sopen(char *buf, ssize_t bsize, int sflags, struct shf *shf)
{
if (!((sflags & SHF_RD) ^ (sflags & SHF_WR)))
internal_errorf(Tbad_flags, "shf_sopen", sflags);
if (!shf) {
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->errnosv = 0;
shf->bsize = bsize;
return (shf);
}
/* Open a string for dynamic writing, using already-allocated buffer */
struct shf *
shf_sreopen(char *buf, ssize_t bsize, Area *ap, struct shf *oshf)
{
struct shf *shf;
shf = shf_sopen(buf, bsize, SHF_WR | SHF_DYNAMIC, oshf);
shf->areap = ap;
shf->flags |= SHF_ALLOCB;
return (shf);
}
/* Check whether the string can grow to take n bytes, close it up otherwise */
int
shf_scheck_grow(ssize_t n, struct shf *shf)
{
if (!(shf->flags & SHF_WR))
internal_errorf(Tbad_flags, "shf_scheck", shf->flags);
/* if n < 0 we lose in the macro already */
/* nōn-string can always grow flushing */
if (!(shf->flags & SHF_STRING))
return (0);
while (shf->wnleft < n)
if (shf_emptybuf(shf, EB_GROW) == -1)
break;
if (shf->wnleft < n) {
/* block subsequent writes as we truncate here */
shf->wnleft = 0;
return (1);
}
return (0);
}
/* Flush and close file descriptor, free the shf structure */
int
shf_close(struct shf *shf)
{
int ret = 0;
if (shf->fd >= 0) {
ret = shf_flush(shf);
if (close(shf->fd) < 0)
ret = -1;
}
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(struct shf *shf)
{
int ret = 0;
if (shf->fd >= 0) {
ret = shf_flush(shf);
if (close(shf->fd) < 0)
ret = -1;
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 NUL 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(struct shf *shf)
{
unsigned char *s = shf->buf;
/* NUL terminate */
if (shf->flags & SHF_WR)
*shf->wp = '\0';
if (shf->flags & SHF_ALLOCS)
afree(shf, shf->areap);
return ((char *)s);
}
/*
* Un-read what has been read but not examined, or write what has been
* buffered. Returns 0 for success, -1 for (write) error.
*/
int
shf_flush(struct shf *shf)
{
int rv = 0;
if (shf->flags & SHF_STRING)
rv = (shf->flags & SHF_WR) ? -1 : 0;
else if (shf->fd < 0)
internal_errorf(Tf_sD_s, "shf_flush", "no fd");
else if (shf->flags & SHF_ERROR) {
errno = shf->errnosv;
rv = -1;
} else if (shf->flags & SHF_READING) {
shf->flags &= ~(SHF_EOF | SHF_READING);
if (shf->rnleft > 0) {
if (lseek(shf->fd, (off_t)-shf->rnleft,
SEEK_CUR) == -1) {
shf->flags |= SHF_ERROR;
shf->errnosv = errno;
rv = -1;
}
shf->rnleft = 0;
shf->rp = shf->buf;
}
} else if (shf->flags & SHF_WRITING)
rv = shf_emptybuf(shf, 0);
return (rv);
}
/*
* Write out any buffered data. If currently reading, flushes the read
* buffer. Returns 0 for success, -1 for (write) error.
*/
static int
shf_emptybuf(struct shf *shf, int flags)
{
int ret = 0;
if (!(shf->flags & SHF_STRING) && shf->fd < 0)
internal_errorf(Tf_sD_s, "shf_emptybuf", "no fd");
if (shf->flags & SHF_ERROR) {
errno = shf->errnosv;
return (-1);
}
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 (-1);
/* allocate more space for buffer */
nbuf = aresize2(shf->buf, 2, shf->wbsize, shf->areap);
shf->rp = nbuf + (shf->rp - shf->buf);
shf->wp = nbuf + (shf->wp - shf->buf);
shf->rbsize += shf->wbsize;
shf->wnleft += shf->wbsize;
shf->wbsize <<= 1;
shf->buf = nbuf;
} else {
if (shf->flags & SHF_WRITING) {
ssize_t n, ntowrite = shf->wp - shf->buf;
unsigned char *buf = shf->buf;
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->errnosv = errno;
shf->wnleft = 0;
if (buf != shf->buf) {
/*
* allow a second flush
* to work
*/
memmove(shf->buf, buf,
ntowrite);
shf->wp = shf->buf + ntowrite;
/* restore errno for caller */
errno = shf->errnosv;
}
return (-1);
}
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 -1 for a read error, 0 otherwise. */
static int
shf_fillbuf(struct shf *shf)
{
ssize_t n;
if (shf->flags & SHF_STRING)
return (0);
if (shf->fd < 0)
internal_errorf(Tf_sD_s, "shf_fillbuf", "no fd");
if (shf->flags & (SHF_EOF | SHF_ERROR)) {
if (shf->flags & SHF_ERROR)
errno = shf->errnosv;
return (-1);
}
if ((shf->flags & SHF_WRITING) && shf_emptybuf(shf, EB_READSW) == -1)
return (-1);
shf->flags |= SHF_READING;
shf->rp = shf->buf;
while (/* CONSTCOND */ 1) {
n = blocking_read(shf->fd, (char *)shf->buf, shf->rbsize);
if (n < 0 && errno == EINTR && !(shf->flags & SHF_INTERRUPT))
continue;
break;
}
if (n < 0) {
shf->flags |= SHF_ERROR;
shf->errnosv = errno;
shf->rnleft = 0;
shf->rp = shf->buf;
return (-1);
}
if ((shf->rnleft = n) == 0)
shf->flags |= SHF_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, -1 if a read
* error occurred.
*/
ssize_t
shf_read(char *buf, ssize_t bsize, struct shf *shf)
{
ssize_t ncopy, orig_bsize = bsize;
if (!(shf->flags & SHF_RD))
internal_errorf(Tbad_flags, Tshf_read, shf->flags);
if (bsize <= 0)
internal_errorf(Tbad_buf, Tshf_read, (size_t)buf, bsize);
while (bsize > 0) {
if (shf->rnleft == 0 &&
(shf_fillbuf(shf) == -1 || 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) ? -1 : 0) :
orig_bsize - bsize);
}
/*
* Read up to a newline or -1. The newline is put in buf; buf is always
* NUL terminated. Returns NULL on read error or if nothing was read
* before end of file, returns a pointer to the NUL byte in buf
* otherwise.
*/
char *
shf_getse(char *buf, ssize_t bsize, struct shf *shf)
{
unsigned char *end;
ssize_t ncopy;
char *orig_buf = buf;
if (!(shf->flags & SHF_RD))
internal_errorf(Tbad_flags, "shf_getse", shf->flags);
if (bsize <= 0)
return (NULL);
/* save room for NUL */
--bsize;
do {
if (shf->rnleft == 0) {
if (shf_fillbuf(shf) == -1)
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 MKSH_WITH_TEXTMODE
if (buf > orig_buf + 1 && ord(buf[-2]) == ORD('\r') &&
ord(buf[-1]) == ORD('\n')) {
buf--;
bsize++;
buf[-1] = '\n';
}
#endif
} while (!end && bsize);
#ifdef MKSH_WITH_TEXTMODE
if (!bsize && ord(buf[-1]) == ORD('\r')) {
int c = shf_getc(shf);
if (ord(c) == ORD('\n'))
buf[-1] = '\n';
else if (c != -1)
shf_ungetc(c, shf);
}
#endif
*buf = '\0';
return (buf);
}
/* Returns the char read. Returns -1 for error and end of file. */
int
shf_getchar(struct shf *shf)
{
if (!(shf->flags & SHF_RD))
internal_errorf(Tbad_flags, "shf_getchar", shf->flags);
if (shf->rnleft == 0 && (shf_fillbuf(shf) == -1 || shf->rnleft == 0))
return (-1);
--shf->rnleft;
return (ord(*shf->rp++));
}
/*
* Put a character back in the input stream. Returns the character if
* successful, -1 if there is no room.
*/
int
shf_ungetc(int c, struct shf *shf)
{
if (!(shf->flags & SHF_RD))
internal_errorf(Tbad_flags, "shf_ungetc", shf->flags);
if ((shf->flags & SHF_ERROR) || c == -1 ||
(shf->rp == shf->buf && shf->rnleft))
return (-1);
if ((shf->flags & SHF_WRITING) && shf_emptybuf(shf, EB_READSW) == -1)
return (-1);
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 ((int)(shf->rp[-1]) != c)
return (-1);
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, -1 if the
* char could not be written.
*/
int
shf_putchar(int c, struct shf *shf)
{
if (!(shf->flags & SHF_WR))
internal_errorf(Tbad_flags, "shf_putchar",shf->flags);
if (c == -1)
return (-1);
if (shf->flags & SHF_UNBUF) {
unsigned char cc = (unsigned char)c;
ssize_t n;
if (shf->fd < 0)
internal_errorf(Tf_sD_s, "shf_putchar", "no fd");
if (shf->flags & SHF_ERROR) {
errno = shf->errnosv;
return (-1);
}
while ((n = write(shf->fd, &cc, 1)) != 1)
if (n < 0) {
if (errno == EINTR &&
!(shf->flags & SHF_INTERRUPT))
continue;
shf->flags |= SHF_ERROR;
shf->errnosv = errno;
return (-1);
}
} else {
/* Flush deals with strings and sticky errors */
if (shf->wnleft == 0 && shf_emptybuf(shf, EB_GROW) == -1)
return (-1);
shf->wnleft--;
*shf->wp++ = c;
}
return (c);
}
/*
* Write a string. Returns the length of the string if successful,
* less if truncated, and -1 if the string could not be written.
*/
ssize_t
shf_puts(const char *s, struct shf *shf)
{
if (!s)
return (-1);
return (shf_write(s, strlen(s), shf));
}
/*
* Write a buffer. Returns nbytes if successful, less if truncated
* (outputting to string only), and -1 if there is an error.
*/
ssize_t
shf_write(const char *buf, ssize_t nbytes, struct shf *shf)
{
ssize_t n, ncopy, orig_nbytes = nbytes;
if (!(shf->flags & SHF_WR))
internal_errorf(Tbad_flags, Tshf_write, shf->flags);
if (nbytes < 0)
internal_errorf(Tbad_buf, Tshf_write, (size_t)buf, nbytes);
/* don't buffer if buffer is empty and we're writing 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) {
if (shf->flags & SHF_STRING) {
/* resize buffer until there's enough space left */
while (nbytes > shf->wnleft)
if (shf_emptybuf(shf, EB_GROW) == -1) {
/* truncate if possible */
if (shf->wnleft == 0)
return (-1);
nbytes = shf->wnleft;
break;
}
/* then write everything into the buffer */
} else {
/* flush deals with sticky errors */
if (shf_emptybuf(shf, EB_GROW) == -1)
return (-1);
/* write chunks larger than window size directly */
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->errnosv = errno;
shf->wnleft = 0;
/*
* Note: fwrite(3) returns 0
* for errors - this doesn't
*/
return (-1);
}
buf += n;
ncopy -= n;
}
}
/* ... and buffer the rest */
}
if (nbytes > 0) {
/* write remaining bytes to buffer */
memcpy(shf->wp, buf, nbytes);
shf->wp += nbytes;
shf->wnleft -= nbytes;
}
}
return (orig_nbytes);
}
ssize_t
shf_fprintf(struct shf *shf, const char *fmt, ...)
{
va_list args;
ssize_t n;
va_start(args, fmt);
n = shf_vfprintf(shf, fmt, args);
va_end(args);
return (n);
}
ssize_t
shf_snprintf(char *buf, ssize_t bsize, const char *fmt, ...)
{
struct shf shf;
va_list args;
ssize_t n;
if (!buf || bsize <= 0)
internal_errorf(Tbad_buf, "shf_snprintf", (size_t)buf, bsize);
shf_sopen(buf, bsize, SHF_WR, &shf);
va_start(args, fmt);
n = shf_vfprintf(&shf, fmt, args);
va_end(args);
/* NUL terminates */
shf_sclose(&shf);
return (n);
}
char *
shf_smprintf(const char *fmt, ...)
{
struct shf shf;
va_list args;
shf_sopen(NULL, 0, SHF_WR|SHF_DYNAMIC, &shf);
va_start(args, fmt);
shf_vfprintf(&shf, fmt, args);
va_end(args);
/* NUL terminates */
return (shf_sclose(&shf));
}
#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 formatted %[douxefg] */
#define FL_SIZET 0x400 /* 'z' seen */
#define FM_SIZES 0x430 /* h/l/z mask */
ssize_t
shf_vfprintf(struct shf *shf, const char *fmt, va_list args)
{
const char *s;
char c, *cp;
int tmp = 0, flags;
size_t field, precision, len;
unsigned long lnum;
/* %#o produces the longest output */
char numbuf[(8 * sizeof(long) + 2) / 3 + 1 + /* NUL */ 1];
/* this stuff for dealing with the buffer */
ssize_t nwritten = 0;
/* for width determination */
const char *lp, *np;
#define VA(type) va_arg(args, type)
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
* restriction is that the format character must come
* last :-).
*/
flags = 0;
field = precision = 0;
while ((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(int);
if (tmp < 0) {
if (flags & FL_DOT)
precision = 0;
else {
field = (unsigned int)-tmp;
flags |= FL_RIGHT;
}
} else if (flags & FL_DOT)
precision = (unsigned int)tmp;
else
field = (unsigned int)tmp;
continue;
case 'l':
flags &= ~FM_SIZES;
flags |= FL_LONG;
continue;
case 'h':
flags &= ~FM_SIZES;
flags |= FL_SHORT;
continue;
case 'z':
flags &= ~FM_SIZES;
flags |= FL_SIZET;
continue;
}
if (ctype(c, C_DIGIT)) {
--fmt;
getpn((const char **)&fmt, &tmp);
if (flags & FL_DOT)
precision = (unsigned int)tmp;
else
field = (unsigned int)tmp;
continue;
}
break;
}
if (!c)
/* nasty format */
break;
if (ctype(c, C_UPPER)) {
flags |= FL_UPPER;
c = ksh_tolower(c);
}
switch (c) {
case 'd':
case 'i':
if (flags & FL_SIZET)
lnum = (long)VA(ssize_t);
else if (flags & FL_LONG)
lnum = VA(long);
else if (flags & FL_SHORT)
lnum = (long)(short)VA(int);
else
lnum = (long)VA(int);
goto integral;
case 'o':
case 'u':
case 'x':
if (flags & FL_SIZET)
lnum = VA(size_t);
else if (flags & FL_LONG)
lnum = VA(unsigned long);
else if (flags & FL_SHORT)
lnum = (unsigned long)(unsigned short)VA(int);
else
lnum = (unsigned long)VA(unsigned int);
integral:
flags |= FL_NUMBER;
cp = numbuf + sizeof(numbuf);
*--cp = '\0';
switch (c) {
case 'd':
case 'i':
if (0 > (long)lnum) {
lnum = -(long)lnum;
tmp = 1;
} else
tmp = 0;
/* FALLTHROUGH */
case 'u':
do {
*--cp = digits_lc[lnum % 10];
lnum /= 10;
} while (lnum);
if (c != 'u') {
if (tmp)
*--cp = '-';
else if (flags & FL_PLUS)
*--cp = '+';
else if (flags & FL_BLANK)
*--cp = ' ';
}
break;
case 'o':
do {
*--cp = digits_lc[lnum & 0x7];
lnum >>= 3;