diff options
Diffstat (limited to 'lib/termcap/termcap.c')
| -rw-r--r-- | lib/termcap/termcap.c | 800 |
1 files changed, 800 insertions, 0 deletions
diff --git a/lib/termcap/termcap.c b/lib/termcap/termcap.c new file mode 100644 index 0000000..780b15c --- /dev/null +++ b/lib/termcap/termcap.c @@ -0,0 +1,800 @@ +/* Work-alike for termcap, plus extra features. + Copyright (C) 1985, 86, 93, 94, 95 Free Software Foundation, Inc. + +This program is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +This program is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this program; see the file COPYING. If not, write to the +Free Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */ + +/* Emacs config.h may rename various library functions such as malloc. */ +#ifdef HAVE_CONFIG_H + +#include <config.h> + +/* Get the O_* definitions for open et al. */ +#if !defined (_MINIX) && defined (HAVE_SYS_FILE_H) +# include <sys/file.h> +#endif + +#include <fcntl.h> + +#ifdef HAVE_STDLIB_H +# include <stdlib.h> +#else +extern char *getenv (); +extern char *malloc (); +extern char *realloc (); +#endif + +#else /* not HAVE_CONFIG_H */ + +#ifdef STDC_HEADERS +#include <stdlib.h> +#include <string.h> +#else +char *getenv (); +char *malloc (); +char *realloc (); +#endif + +/* Do this after the include, in case string.h prototypes bcopy. */ +#if (defined(HAVE_STRING_H) || defined(STDC_HEADERS)) && !defined(bcopy) +#define bcopy(s, d, n) memcpy ((d), (s), (n)) +#endif + +#ifdef HAVE_UNISTD_H +#include <unistd.h> +#endif +#ifdef _POSIX_VERSION +#include <fcntl.h> +#endif + +#endif /* not HAVE_CONFIG_H */ + +#ifndef NULL +#define NULL (char *) 0 +#endif + +#ifndef O_RDONLY +#define O_RDONLY 0 +#endif + +/* BUFSIZE is the initial size allocated for the buffer + for reading the termcap file. + It is not a limit. + Make it large normally for speed. + Make it variable when debugging, so can exercise + increasing the space dynamically. */ + +#ifndef BUFSIZE +#ifdef DEBUG +#define BUFSIZE bufsize + +int bufsize = 128; +#else +#define BUFSIZE 2048 +#endif +#endif + +#include "ltcap.h" + +#ifndef TERMCAP_FILE +#define TERMCAP_FILE "/etc/termcap" +#endif + +#ifndef emacs +static void +memory_out () +{ + write (2, "virtual memory exhausted\n", 25); + exit (1); +} + +static char * +xmalloc (size) + unsigned size; +{ + register char *tem = malloc (size); + + if (!tem) + memory_out (); + return tem; +} + +static char * +xrealloc (ptr, size) + char *ptr; + unsigned size; +{ + register char *tem = realloc (ptr, size); + + if (!tem) + memory_out (); + return tem; +} +#endif /* not emacs */ + +/* Looking up capabilities in the entry already found. */ + +/* The pointer to the data made by tgetent is left here + for tgetnum, tgetflag and tgetstr to find. */ +static char *term_entry; + +static char *tgetst1 (); + +/* Search entry BP for capability CAP. + Return a pointer to the capability (in BP) if found, + 0 if not found. */ + +static char * +find_capability (bp, cap) + register char *bp, *cap; +{ + for (; *bp; bp++) + if (bp[0] == ':' + && bp[1] == cap[0] + && bp[2] == cap[1]) + return &bp[4]; + return NULL; +} + +__private_extern__ +int +tgetnum (cap) + char *cap; +{ + register char *ptr = find_capability (term_entry, cap); + if (!ptr || ptr[-1] != '#') + return -1; + return atoi (ptr); +} + +__private_extern__ +int +tgetflag (cap) + char *cap; +{ + register char *ptr = find_capability (term_entry, cap); + return ptr && ptr[-1] == ':'; +} + +/* Look up a string-valued capability CAP. + If AREA is non-null, it points to a pointer to a block in which + to store the string. That pointer is advanced over the space used. + If AREA is null, space is allocated with `malloc'. */ + +__private_extern__ +char * +tgetstr (cap, area) + char *cap; + char **area; +{ + register char *ptr = find_capability (term_entry, cap); + if (!ptr || (ptr[-1] != '=' && ptr[-1] != '~')) + return NULL; + return tgetst1 (ptr, area); +} + +/* Table, indexed by a character in range 0100 to 0140 with 0100 subtracted, + gives meaning of character following \, or a space if no special meaning. + Eight characters per line within the string. */ + +static char esctab[] + = " \007\010 \033\014 \ + \012 \ + \015 \011 \013 \ + "; + +/* PTR points to a string value inside a termcap entry. + Copy that value, processing \ and ^ abbreviations, + into the block that *AREA points to, + or to newly allocated storage if AREA is NULL. + Return the address to which we copied the value, + or NULL if PTR is NULL. */ + +static char * +tgetst1 (ptr, area) + char *ptr; + char **area; +{ + register char *p, *r; + register int c; + register int size; + char *ret; + register int c1; + + if (!ptr) + return NULL; + + /* `ret' gets address of where to store the string. */ + if (!area) + { + /* Compute size of block needed (may overestimate). */ + p = ptr; + while ((c = *p++) && c != ':' && c != '\n') + ; + ret = (char *) xmalloc (p - ptr + 1); + } + else + ret = *area; + + /* Copy the string value, stopping at null or colon. + Also process ^ and \ abbreviations. */ + p = ptr; + r = ret; + while ((c = *p++) && c != ':' && c != '\n') + { + if (c == '^') + { + c = *p++; + if (c == '?') + c = 0177; + else + c &= 037; + } + else if (c == '\\') + { + c = *p++; + if (c >= '0' && c <= '7') + { + c -= '0'; + size = 0; + + while (++size < 3 && (c1 = *p) >= '0' && c1 <= '7') + { + c *= 8; + c += c1 - '0'; + p++; + } + } + else if (c >= 0100 && c < 0200) + { + c1 = esctab[(c & ~040) - 0100]; + if (c1 != ' ') + c = c1; + } + } + *r++ = c; + } + *r = '\0'; + /* Update *AREA. */ + if (area) + *area = r + 1; + return ret; +} + +/* Outputting a string with padding. */ + +short ospeed; +/* If OSPEED is 0, we use this as the actual baud rate. */ +int tputs_baud_rate; +__private_extern__ char PC = '\0'; + +/* Actual baud rate if positive; + - baud rate / 100 if negative. */ + +static int speeds[] = + { +#ifdef VMS + 0, 50, 75, 110, 134, 150, -3, -6, -12, -18, + -20, -24, -36, -48, -72, -96, -192 +#else /* not VMS */ + 0, 50, 75, 110, 135, 150, -2, -3, -6, -12, + -18, -24, -48, -96, -192, -288, -384, -576, -1152 +#endif /* not VMS */ + }; + +__private_extern__ +void +tputs (str, nlines, outfun) + register char *str; + int nlines; + register int (*outfun) (); +{ + register int padcount = 0; + register int speed; + +#ifdef emacs + extern baud_rate; + speed = baud_rate; + /* For quite high speeds, convert to the smaller + units to avoid overflow. */ + if (speed > 10000) + speed = - speed / 100; +#else + if (ospeed == 0) + speed = tputs_baud_rate; + else if (ospeed > 0 && ospeed < (sizeof speeds / sizeof speeds[0])) + speed = speeds[ospeed]; + else + speed = 0; +#endif + + if (!str) + return; + + while (*str >= '0' && *str <= '9') + { + padcount += *str++ - '0'; + padcount *= 10; + } + if (*str == '.') + { + str++; + padcount += *str++ - '0'; + } + if (*str == '*') + { + str++; + padcount *= nlines; + } + while (*str) + (*outfun) (*str++); + + /* PADCOUNT is now in units of tenths of msec. + SPEED is measured in characters per 10 seconds + or in characters per .1 seconds (if negative). + We use the smaller units for larger speeds to avoid overflow. */ + padcount *= speed; + padcount += 500; + padcount /= 1000; + if (speed < 0) + padcount = -padcount; + else + { + padcount += 50; + padcount /= 100; + } + + while (padcount-- > 0) + (*outfun) (PC); +} + +/* Finding the termcap entry in the termcap data base. */ + +struct buffer + { + char *beg; + int size; + char *ptr; + int ateof; + int full; + }; + +/* Forward declarations of static functions. */ + +static int scan_file (); +static char *gobble_line (); +static int compare_contin (); +static int name_match (); + +#ifdef VMS + +#include <rmsdef.h> +#include <fab.h> +#include <nam.h> + +static int +valid_filename_p (fn) + char *fn; +{ + struct FAB fab = cc$rms_fab; + struct NAM nam = cc$rms_nam; + char esa[NAM$C_MAXRSS]; + + fab.fab$l_fna = fn; + fab.fab$b_fns = strlen(fn); + fab.fab$l_nam = &nam; + fab.fab$l_fop = FAB$M_NAM; + + nam.nam$l_esa = esa; + nam.nam$b_ess = sizeof esa; + + return SYS$PARSE(&fab, 0, 0) == RMS$_NORMAL; +} + +#else /* !VMS */ + +#ifdef MSDOS /* MW, May 1993 */ +static int +valid_filename_p (fn) + char *fn; +{ + return *fn == '\\' || *fn == '/' || + (*fn >= 'A' && *fn <= 'z' && fn[1] == ':'); +} +#else +#define valid_filename_p(fn) (*(fn) == '/') +#endif + +#endif /* !VMS */ + +/* Find the termcap entry data for terminal type NAME + and store it in the block that BP points to. + Record its address for future use. + + If BP is null, space is dynamically allocated. + + Return -1 if there is some difficulty accessing the data base + of terminal types, + 0 if the data base is accessible but the type NAME is not defined + in it, and some other value otherwise. */ + +__private_extern__ +int +tgetent (bp, name) + char *bp, *name; +{ + register char *termcap_name; + register int fd; + struct buffer buf; + register char *bp1; + char *bp2; + char *term; + int malloc_size = 0; + register int c; + char *tcenv; /* TERMCAP value, if it contains :tc=. */ + char *indirect = NULL; /* Terminal type in :tc= in TERMCAP value. */ + int filep; + +#ifdef INTERNAL_TERMINAL + /* For the internal terminal we don't want to read any termcap file, + so fake it. */ + if (!strcmp (name, "internal")) + { + term = INTERNAL_TERMINAL; + if (!bp) + { + malloc_size = 1 + strlen (term); + bp = (char *) xmalloc (malloc_size); + } + strcpy (bp, term); + goto ret; + } +#endif /* INTERNAL_TERMINAL */ + + /* For compatibility with programs like `less' that want to + put data in the termcap buffer themselves as a fallback. */ + if (bp) + term_entry = bp; + + termcap_name = getenv ("TERMCAP"); + if (termcap_name && *termcap_name == '\0') + termcap_name = NULL; +#if 0 +#if defined (MSDOS) && !defined (TEST) + if (termcap_name && (*termcap_name == '\\' + || *termcap_name == '/' + || termcap_name[1] == ':')) + dostounix_filename(termcap_name); +#endif +#endif + + filep = termcap_name && valid_filename_p (termcap_name); + + /* If termcap_name is non-null and starts with / (in the un*x case, that is), + it is a file name to use instead of /etc/termcap. + If it is non-null and does not start with /, + it is the entry itself, but only if + the name the caller requested matches the TERM variable. */ + + if (termcap_name && !filep && !strcmp (name, getenv ("TERM"))) + { + indirect = tgetst1 (find_capability (termcap_name, "tc"), (char **) 0); + if (!indirect) + { + if (!bp) + bp = termcap_name; + else + strcpy (bp, termcap_name); + goto ret; + } + else + { /* It has tc=. Need to read /etc/termcap. */ + tcenv = termcap_name; + termcap_name = NULL; + } + } + + if (!termcap_name || !filep) + termcap_name = TERMCAP_FILE; + + /* Here we know we must search a file and termcap_name has its name. */ + +#ifdef MSDOS + fd = open (termcap_name, O_RDONLY|O_TEXT, 0); +#else + fd = open (termcap_name, O_RDONLY, 0); +#endif + if (fd < 0) + return -1; + + buf.size = BUFSIZE; + /* Add 1 to size to ensure room for terminating null. */ + buf.beg = (char *) xmalloc (buf.size + 1); + term = indirect ? indirect : name; + + if (!bp) + { + malloc_size = indirect ? strlen (tcenv) + 1 : buf.size; + bp = (char *) xmalloc (malloc_size); + } + bp1 = bp; + + if (indirect) + /* Copy the data from the environment variable. */ + { + strcpy (bp, tcenv); + bp1 += strlen (tcenv); + } + + while (term) + { + /* Scan the file, reading it via buf, till find start of main entry. */ + if (scan_file (term, fd, &buf) == 0) + { + close (fd); + free (buf.beg); + if (malloc_size) + free (bp); + return 0; + } + + /* Free old `term' if appropriate. */ + if (term != name) + free (term); + + /* If BP is malloc'd by us, make sure it is big enough. */ + if (malloc_size) + { + malloc_size = bp1 - bp + buf.size; + termcap_name = (char *) xrealloc (bp, malloc_size); + bp1 += termcap_name - bp; + bp = termcap_name; + } + + bp2 = bp1; + + /* Copy the line of the entry from buf into bp. */ + termcap_name = buf.ptr; + while ((*bp1++ = c = *termcap_name++) && c != '\n') + /* Drop out any \ newline sequence. */ + if (c == '\\' && *termcap_name == '\n') + { + bp1--; + termcap_name++; + } + *bp1 = '\0'; + + /* Does this entry refer to another terminal type's entry? + If something is found, copy it into heap and null-terminate it. */ + term = tgetst1 (find_capability (bp2, "tc"), (char **) 0); + } + + close (fd); + free (buf.beg); + + if (malloc_size) + bp = (char *) xrealloc (bp, bp1 - bp + 1); + + ret: + term_entry = bp; + return 1; +} + +/* Given file open on FD and buffer BUFP, + scan the file from the beginning until a line is found + that starts the entry for terminal type STR. + Return 1 if successful, with that line in BUFP, + or 0 if no entry is found in the file. */ + +static int +scan_file (str, fd, bufp) + char *str; + int fd; + register struct buffer *bufp; +{ + register char *end; + + bufp->ptr = bufp->beg; + bufp->full = 0; + bufp->ateof = 0; + *bufp->ptr = '\0'; + + lseek (fd, 0L, 0); + + while (!bufp->ateof) + { + /* Read a line into the buffer. */ + end = NULL; + do + { + /* if it is continued, append another line to it, + until a non-continued line ends. */ + end = gobble_line (fd, bufp, end); + } + while (!bufp->ateof && end[-2] == '\\'); + + if (*bufp->ptr != '#' + && name_match (bufp->ptr, str)) + return 1; + + /* Discard the line just processed. */ + bufp->ptr = end; + } + return 0; +} + +/* Return nonzero if NAME is one of the names specified + by termcap entry LINE. */ + +static int +name_match (line, name) + char *line, *name; +{ + register char *tem; + + if (!compare_contin (line, name)) + return 1; + /* This line starts an entry. Is it the right one? */ + for (tem = line; *tem && *tem != '\n' && *tem != ':'; tem++) + if (*tem == '|' && !compare_contin (tem + 1, name)) + return 1; + + return 0; +} + +static int +compare_contin (str1, str2) + register char *str1, *str2; +{ + register int c1, c2; + while (1) + { + c1 = *str1++; + c2 = *str2++; + while (c1 == '\\' && *str1 == '\n') + { + str1++; + while ((c1 = *str1++) == ' ' || c1 == '\t'); + } + if (c2 == '\0') + { + /* End of type being looked up. */ + if (c1 == '|' || c1 == ':') + /* If end of name in data base, we win. */ + return 0; + else + return 1; + } + else if (c1 != c2) + return 1; + } +} + +/* Make sure that the buffer <- BUFP contains a full line + of the file open on FD, starting at the place BUFP->ptr + points to. Can read more of the file, discard stuff before + BUFP->ptr, or make the buffer bigger. + + Return the pointer to after the newline ending the line, + or to the end of the file, if there is no newline to end it. + + Can also merge on continuation lines. If APPEND_END is + non-null, it points past the newline of a line that is + continued; we add another line onto it and regard the whole + thing as one line. The caller decides when a line is continued. */ + +static char * +gobble_line (fd, bufp, append_end) + int fd; + register struct buffer *bufp; + char *append_end; +{ + register char *end; + register int nread; + register char *buf = bufp->beg; + register char *tem; + + if (!append_end) + append_end = bufp->ptr; + + while (1) + { + end = append_end; + while (*end && *end != '\n') end++; + if (*end) + break; + if (bufp->ateof) + return buf + bufp->full; + if (bufp->ptr == buf) + { + if (bufp->full == bufp->size) + { + bufp->size *= 2; + /* Add 1 to size to ensure room for terminating null. */ + tem = (char *) xrealloc (buf, bufp->size + 1); + bufp->ptr = (bufp->ptr - buf) + tem; + append_end = (append_end - buf) + tem; + bufp->beg = buf = tem; + } + } + else + { + append_end -= bufp->ptr - buf; + bcopy (bufp->ptr, buf, bufp->full -= bufp->ptr - buf); + bufp->ptr = buf; + } + if (!(nread = read (fd, buf + bufp->full, bufp->size - bufp->full))) + bufp->ateof = 1; + bufp->full += nread; + buf[bufp->full] = '\0'; + } + return end + 1; +} + +#ifdef TEST + +#ifdef NULL +#undef NULL +#endif + +#include <stdio.h> + +main (argc, argv) + int argc; + char **argv; +{ + char *term; + char *buf; + + term = argv[1]; + printf ("TERM: %s\n", term); + + buf = (char *) tgetent (0, term); + if ((int) buf <= 0) + { + printf ("No entry.\n"); + return 0; + } + + printf ("Entry: %s\n", buf); + + tprint ("cm"); + tprint ("AL"); + + printf ("co: %d\n", tgetnum ("co")); + printf ("am: %d\n", tgetflag ("am")); +} + +tprint (cap) + char *cap; +{ + char *x = tgetstr (cap, 0); + register char *y; + + printf ("%s: ", cap); + if (x) + { + for (y = x; *y; y++) + if (*y <= ' ' || *y == 0177) + printf ("\\%0o", *y); + else + putchar (*y); + free (x); + } + else + printf ("none"); + putchar ('\n'); +} + +#endif /* TEST */ |