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-rw-r--r--input.c363
1 files changed, 0 insertions, 363 deletions
diff --git a/input.c b/input.c
deleted file mode 100644
index 3b60677..0000000
--- a/input.c
+++ /dev/null
@@ -1,363 +0,0 @@
-/* input.c: i/o routines for files and pseudo-files (strings) */
-
-#include <errno.h>
-#include <setjmp.h>
-#include "rc.h"
-#include "jbwrap.h"
-
-/*
- NB: character unget is supported for up to two characters, but NOT
- in the case of EOF. Since EOF does not fit in a char, it is easiest
- to support only one unget of EOF.
-*/
-
-typedef struct Input {
- inputtype t;
- char *ibuf;
- int fd, index, read, lineno, last;
- bool saved, eofread;
-} Input;
-
-#define BUFSIZE ((size_t) 256)
-
-#if READLINE
-extern char *readline(char *);
-extern void add_history(char *);
-static char *rlinebuf;
-#endif
-
-char *prompt, *prompt2;
-bool rcrc;
-
-static int dead(void);
-static int fdgchar(void);
-static int stringgchar(void);
-static void history(void);
-static void ugdead(int);
-static void pushcommon(void);
-
-static char *inbuf;
-static size_t istacksize, chars_out, chars_in;
-static bool eofread = FALSE, save_lineno = TRUE;
-static Input *istack, *itop;
-
-static int (*realgchar)(void);
-static void (*realugchar)(int);
-
-int last;
-
-extern int gchar() {
- int c;
-
- if (eofread) {
- eofread = FALSE;
- return last = EOF;
- }
-
- while ((c = (*realgchar)()) == '\0')
- pr_error("warning: null character ignored");
-
- return c;
-}
-
-extern void ugchar(int c) {
- (*realugchar)(c);
-}
-
-static int dead() {
- return last = EOF;
-}
-
-static void ugdead(int c) {
- return;
-}
-
-static void ugalive(int c) {
- if (c == EOF)
- eofread = TRUE;
- else
- inbuf[--chars_out] = c;
-}
-
-/* get the next character from a string. */
-
-static int stringgchar() {
- return last = (inbuf[chars_out] == '\0' ? EOF : inbuf[chars_out++]);
-}
-
-/* signal-safe readline wrapper */
-
-#if READLINE
-#ifndef HAVE_RESTARTABLE_SYSCALLS
-static char *rc_readline(char *prompt) {
- char *r;
- interrupt_happened = FALSE;
- if (!setjmp(slowbuf.j)) {
- slow = TRUE;
- if (!interrupt_happened)
- r = readline(prompt);
- else
- r = NULL;
- } else
- r = NULL;
- slow = FALSE;
- if (r == NULL)
- errno = EINTR;
- sigchk();
- return r;
-}
-#else
-#define rc_readline readline
-#endif /* HAVE_RESTARTABLE_SYSCALLS */
-#endif /* READLINE */
-
-/*
- read a character from a file-descriptor. If GNU readline is defined, add a newline and doctor
- the buffer to look like a regular fdgchar buffer.
-*/
-
-static int fdgchar() {
- if (chars_out >= chars_in + 2) { /* has the buffer been exhausted? if so, replenish it */
- while (1) {
-#if READLINE
- if (interactive && istack->fd == 0) {
- rlinebuf = rc_readline(prompt);
- if (rlinebuf == NULL) {
- chars_in = 0;
- } else {
- if (*rlinebuf != '\0')
- add_history(rlinebuf);
- chars_in = strlen(rlinebuf) + 1;
- efree(inbuf);
- inbuf = ealloc(chars_in + 3);
- strcpy(inbuf+2, rlinebuf);
- strcat(inbuf+2, "\n");
- efree(rlinebuf);
- }
- } else
-#endif
- {
- long /*ssize_t*/ r = rc_read(istack->fd, inbuf + 2, BUFSIZE);
- sigchk();
- if (r < 0) {
- uerror("read");
- rc_exit(1);
- }
- chars_in = (size_t) r;
- }
- break;
- }
- if (chars_in == 0)
- return last = EOF;
- chars_out = 2;
- if (dashvee)
- writeall(2, inbuf + 2, chars_in);
- history();
- }
- return last = inbuf[chars_out++];
-}
-
-/* set up the input stack, and put a "dead" input at the bottom, so that yyparse will always read eof */
-
-extern void initinput() {
- istack = itop = ealloc(istacksize = 256 * sizeof (Input));
- istack->t = iFd;
- istack->fd = -1;
- realugchar = ugalive;
-}
-
-/* push an input source onto the stack. set up a new input buffer, and set gchar() */
-
-static void pushcommon() {
- size_t idiff;
- istack->index = chars_out;
- istack->read = chars_in;
- istack->ibuf = inbuf;
- istack->lineno = lineno;
- istack->saved = save_lineno;
- istack->last = last;
- istack->eofread = eofread;
- istack++;
- idiff = istack - itop;
- if (idiff >= istacksize / sizeof (Input)) {
- itop = erealloc(itop, istacksize *= 2);
- istack = itop + idiff;
- }
- realugchar = ugalive;
- chars_out = 2;
- chars_in = 0;
-}
-
-extern void pushfd(int fd) {
- pushcommon();
- istack->t = iFd;
- save_lineno = TRUE;
- istack->fd = fd;
- realgchar = fdgchar;
- inbuf = ealloc(BUFSIZE + 2);
- lineno = 1;
-}
-
-extern void pushstring(char **a, bool save) {
- pushcommon();
- istack->t = iString;
- save_lineno = save;
- inbuf = mprint("..%A", a);
- realgchar = stringgchar;
- if (save_lineno)
- lineno = 1;
- else
- --lineno;
-}
-
-/* remove an input source from the stack. restore the right kind of getchar (string,fd) etc. */
-
-extern void popinput() {
- if (istack->t == iFd)
- close(istack->fd);
- efree(inbuf);
- --istack;
- realgchar = (istack->t == iString ? stringgchar : fdgchar);
- if (istack->t == iFd && istack->fd == -1) { /* top of input stack */
- realgchar = dead;
- realugchar = ugdead;
- }
- last = istack->last;
- eofread = istack->eofread;
- inbuf = istack->ibuf;
- chars_out = istack->index;
- chars_in = istack->read;
- if (save_lineno)
- lineno = istack->lineno;
- else
- lineno++;
- save_lineno = istack->saved;
-}
-
-/* flush input characters upto newline. Used by scanerror() */
-
-extern void flushu() {
- int c;
- if (last == '\n' || last == EOF)
- return;
- while ((c = gchar()) != '\n' && c != EOF)
- ; /* skip to newline */
- if (c == EOF)
- ugchar(c);
-}
-
-/* the wrapper loop in rc: prompt for commands until EOF, calling yyparse and walk() */
-
-extern Node *doit(bool execit) {
- bool eof;
- Jbwrap j;
- Estack e1, e2;
- Edata jerror;
-
- if (dashen)
- execit = FALSE;
- setjmp(j.j);
- jerror.jb = &j;
- except(eError, jerror, &e1);
- for (eof = FALSE; !eof;) {
- Edata block;
- block.b = newblock();
- except(eArena, block, &e2);
- sigchk();
- if (dashell) {
- char *fname[3];
- fname[1] = concat(varlookup("home"), word("/.rcrc", NULL))->w;
- fname[2] = NULL;
- rcrc = TRUE;
- dashell = FALSE;
- b_dot(fname);
- }
- if (interactive) {
- List *s;
- if (!dashen && fnlookup("prompt") != NULL) {
- static char *arglist[] = { "prompt", NULL };
- funcall(arglist);
- }
- if ((s = varlookup("prompt")) != NULL) {
-#if READLINE
- prompt = s->w;
-#else
- fprint(2, "%s", s->w);
-#endif
- prompt2 = (s->n == NULL ? "" : s->n->w);
- }
- }
- inityy();
- if (yyparse() == 1 && execit)
- rc_raise(eError);
- eof = (last == EOF); /* "last" can be clobbered during a walk() */
- if (parsetree != NULL) {
- if (execit)
- walk(parsetree, TRUE);
- else if (dashex && dashen)
- fprint(2, "%T\n", parsetree);
- }
- unexcept(); /* eArena */
- }
- popinput();
- unexcept(); /* eError */
- return parsetree;
-}
-
-/* parse a function imported from the environment */
-
-extern Node *parseline(char *extdef) {
- int i = interactive;
- char *in[2];
- Node *fun;
- in[0] = extdef;
- in[1] = NULL;
- interactive = FALSE;
- pushstring(in, TRUE);
- fun = doit(FALSE);
- interactive = i;
- return fun;
-}
-
-/* write last command out to a file if interactive && $history is set */
-
-static void history() {
- List *hist;
- size_t a;
-
- if (!interactive || (hist = varlookup("history")) == NULL)
- return;
-
- for (a = 0; a < chars_in; a++) {
- char c = inbuf[a+2];
-
- /* skip empty lines and comments */
- if (c == '#' || c == '\n')
- break;
-
- /* line matches [ \t]*[^#\n] so it's ok to write out */
- if (c != ' ' && c != '\t') {
- char *name = hist->w;
- int fd = rc_open(name, rAppend);
- if (fd < 0) {
- uerror(name);
- varrm(name, TRUE);
- } else {
- writeall(fd, inbuf + 2, chars_in);
- close(fd);
- }
- break;
- }
- }
-}
-
-/* close file descriptors after a fork() */
-
-extern void closefds() {
- Input *i;
- for (i = istack; i != itop; --i) /* close open scripts */
- if (i->t == iFd && i->fd > 2) {
- close(i->fd);
- i->fd = -1;
- }
-}
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