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https://github.com/freebsd/freebsd-src
synced 2024-09-06 17:18:32 +00:00
Implement allowing 'set -v' in the middle of a script to work.
This means that a script containing: echo 1 set -v echo 2 will now produce output, like it does on SYSV machines and other 'proper' /bin/sh implementations.. This is done by a slight restructure of the input processor allowing it to read chunks from the file at a time, but process the data by line from the chunk. Obtained from: Christos Zoulas for NetBSD. <christos@deshaw.com>
This commit is contained in:
parent
2f7778001d
commit
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=12043
185
bin/sh/input.c
185
bin/sh/input.c
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@ -33,7 +33,7 @@
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: input.c,v 1.2 1994/09/24 02:57:39 davidg Exp $
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* $Id: input.c,v 1.3 1995/05/30 00:07:15 rgrimes Exp $
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*/
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#ifndef lint
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@ -65,6 +65,7 @@ struct strpush {
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struct strpush *prev; /* preceding string on stack */
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char *prevstring;
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int prevnleft;
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int prevlleft;
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struct alias *ap; /* if push was associated with an alias */
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};
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@ -78,7 +79,8 @@ struct parsefile {
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struct parsefile *prev; /* preceding file on stack */
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int linno; /* current line */
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int fd; /* file descriptor (or -1 if string) */
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int nleft; /* number of chars left in buffer */
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int nleft; /* number of chars left in line */
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int lleft; /* number of lines left in buffer */
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char *nextc; /* next char in buffer */
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char *buf; /* input buffer */
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struct strpush *strpush; /* for pushing strings at this level */
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@ -88,12 +90,11 @@ struct parsefile {
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int plinno = 1; /* input line number */
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MKINIT int parsenleft; /* copy of parsefile->nleft */
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MKINIT int parselleft; /* copy of parsefile->lleft */
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char *parsenextc; /* copy of parsefile->nextc */
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MKINIT struct parsefile basepf; /* top level input file */
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char basebuf[BUFSIZ]; /* buffer for top level input file */
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struct parsefile *parsefile = &basepf; /* current input file */
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char *pushedstring; /* copy of parsenextc when text pushed back */
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int pushednleft; /* copy of parsenleft when text pushed back */
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int init_editline = 0; /* editline library initialized? */
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int whichprompt; /* 1 == PS1, 2 == PS2 */
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@ -119,7 +120,7 @@ INIT {
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RESET {
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if (exception != EXSHELLPROC)
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parsenleft = 0; /* clear input buffer */
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parselleft = parsenleft = 0; /* clear input buffer */
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popallfiles();
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}
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@ -168,54 +169,31 @@ pgetc() {
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return pgetc_macro();
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}
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static int
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pread()
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{
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int nr;
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/*
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* Refill the input buffer and return the next input character:
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*
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* 1) If a string was pushed back on the input, pop it;
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* 2) If an EOF was pushed back (parsenleft == EOF_NLEFT) or we are reading
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* from a string so we can't refill the buffer, return EOF.
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* 3) Call read to read in the characters.
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* 4) Delete all nul characters from the buffer.
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*/
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int
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preadbuffer() {
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register char *p, *q;
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register int i;
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register int something;
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extern EditLine *el;
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if (parsefile->strpush) {
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popstring();
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if (--parsenleft >= 0)
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return (*parsenextc++);
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}
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if (parsenleft == EOF_NLEFT || parsefile->buf == NULL)
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return PEOF;
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flushout(&output);
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flushout(&errout);
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parsenextc = parsefile->buf;
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retry:
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p = parsenextc = parsefile->buf;
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if (parsefile->fd == 0 && el) {
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const char *rl_cp;
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int len;
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rl_cp = el_gets(el, &len);
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if (rl_cp == NULL) {
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i = 0;
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goto eof;
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rl_cp = el_gets(el, &nr);
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if (rl_cp == NULL)
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nr = 0;
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else {
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/* XXX - BUFSIZE should redesign so not necessary */
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strcpy(parsenextc, rl_cp);
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}
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strcpy(p, rl_cp); /* XXX - BUFSIZE should redesign so not necessary */
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i = len;
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} else {
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regular_read:
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i = read(parsefile->fd, p, BUFSIZ - 1);
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nr = read(parsefile->fd, parsenextc, BUFSIZ - 1);
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}
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eof:
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if (i <= 0) {
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if (i < 0) {
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if (nr <= 0) {
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if (nr < 0) {
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if (errno == EINTR)
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goto retry;
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if (parsefile->fd == 0 && errno == EWOULDBLOCK) {
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@ -229,57 +207,100 @@ preadbuffer() {
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}
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}
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}
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parsenleft = EOF_NLEFT;
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return PEOF;
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nr = -1;
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}
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parsenleft = i - 1; /* we're returning one char in this call */
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return nr;
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}
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/*
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* Refill the input buffer and return the next input character:
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*
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* 1) If a string was pushed back on the input, pop it;
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* 2) If an EOF was pushed back (parsenleft == EOF_NLEFT) or we are reading
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* from a string so we can't refill the buffer, return EOF.
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* 3) If there is more in the buffer, use it; else call read to fill it.
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* 4) Process input up to next newline, deleting nul characters.
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*/
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int
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preadbuffer() {
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char *p, *q;
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int more;
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int something;
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extern EditLine *el;
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char savec;
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if (parsefile->strpush) {
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popstring();
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if (--parsenleft >= 0)
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return (*parsenextc++);
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}
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if (parsenleft == EOF_NLEFT || parsefile->buf == NULL)
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return PEOF;
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flushout(&output);
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flushout(&errout);
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again:
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if (parselleft <= 0) {
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if ((parselleft = pread()) == -1) {
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parselleft = parsenleft = EOF_NLEFT;
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return PEOF;
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}
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}
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q = p = parsenextc;
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/* delete nul characters */
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something = 0;
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for (;;) {
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if (*p == '\0')
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for (more = 1; more;) {
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switch (*p) {
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case '\0':
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p++; /* Skip nul */
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goto check;
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case '\t':
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case ' ':
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break;
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if (*p != ' ' && *p != '\t' && *p != '\n')
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case '\n':
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parsenleft = q - parsenextc;
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more = 0; /* Stop processing here */
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break;
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default:
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something = 1;
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p++;
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if (--i <= 0) {
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*p = '\0';
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goto done; /* no nul characters */
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break;
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}
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*q++ = *p++;
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check:
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if (--parselleft <= 0) {
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parsenleft = q - parsenextc - 1;
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if (parsenleft < 0)
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goto again;
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*q = '\0';
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more = 0;
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}
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}
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/*
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* remove nuls
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*/
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q = p++;
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while (--i > 0) {
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if (*p != '\0')
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*q++ = *p;
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p++;
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}
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*q = '\0';
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if (q == parsefile->buf)
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goto retry; /* buffer contained nothing but nuls */
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parsenleft = q - parsefile->buf - 1;
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done:
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savec = *q;
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*q = '\0';
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if (parsefile->fd == 0 && hist && something) {
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INTOFF;
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history(hist, whichprompt == 1 ? H_ENTER : H_ADD,
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parsefile->buf);
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history(hist, whichprompt == 1 ? H_ENTER : H_ADD, parsenextc);
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INTON;
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}
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if (vflag) {
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/*
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* This isn't right. Most shells coordinate it with
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* reading a line at a time. I honestly don't know if its
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* worth it.
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*/
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i = parsenleft + 1;
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p = parsefile->buf;
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for (; i--; p++)
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out2c(*p)
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out2str(parsenextc);
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flushout(out2);
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}
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*q = savec;
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return *parsenextc++;
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}
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sp = parsefile->strpush = &(parsefile->basestrpush);
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sp->prevstring = parsenextc;
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sp->prevnleft = parsenleft;
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sp->prevlleft = parselleft;
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sp->ap = (struct alias *)ap;
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if (ap)
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((struct alias *)ap)->flag |= ALIASINUSE;
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INTOFF;
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parsenextc = sp->prevstring;
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parsenleft = sp->prevnleft;
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parselleft = sp->prevlleft;
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/*dprintf("*** calling popstring: restoring to '%s'\n", parsenextc);*/
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if (sp->ap)
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sp->ap->flag &= ~ALIASINUSE;
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parsefile->fd = fd;
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if (parsefile->buf == NULL)
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parsefile->buf = ckmalloc(BUFSIZ);
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parsenleft = 0;
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parselleft = parsenleft = 0;
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plinno = 1;
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}
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if (push)
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pushfile();
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parsenextc = string;
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parsenleft = strlen(string);
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parselleft = parsenleft = strlen(string);
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parsefile->buf = NULL;
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plinno = 1;
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INTON;
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struct parsefile *pf;
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parsefile->nleft = parsenleft;
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parsefile->lleft = parselleft;
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parsefile->nextc = parsenextc;
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parsefile->linno = plinno;
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pf = (struct parsefile *)ckmalloc(sizeof (struct parsefile));
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parsefile = pf->prev;
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ckfree(pf);
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parsenleft = parsefile->nleft;
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parselleft = parsefile->lleft;
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parsenextc = parsefile->nextc;
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plinno = parsefile->linno;
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INTON;
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