463 lines
8.6 KiB
C
463 lines
8.6 KiB
C
/*
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* termcap.c 1.1 20/7/87 agc Joypace Ltd
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*
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* Copyright Joypace Ltd, London, UK, 1987. All rights reserved.
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* This file may be freely distributed provided that this notice
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* remains attached.
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*
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* A public domain implementation of the termcap(3) routines.
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*
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* Made fully functional by Ceriel J.H. Jacobs.
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*
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* BUGS:
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* - does not check termcap entry sizes
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* - not fully tested
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*/
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/* $Id$ */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#define CAPABLEN 2
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#define ISSPACE(c) ((c) == ' ' || (c) == '\t' || (c) == '\r' || (c) == '\n')
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#define ISDIGIT(x) ((x) >= '0' && (x) <= '9')
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short ospeed; /* output speed */
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char PC; /* padding character */
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char* BC; /* back cursor movement */
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char* UP; /* up cursor movement */
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static const char* capab; /* the capability itself */
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static int check_for_tc(void);
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static int match_name(const char* buf, const char* name);
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/*
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* tgetent - get the termcap entry for terminal name, and put it
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* in bp (which must be an array of 1024 chars). Returns 1 if
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* termcap entry found, 0 if not found, and -1 if file not found.
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*/
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int tgetent(char* bp, const char* name)
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{
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FILE* fp;
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char* file;
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char* cp;
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char buf[1024];
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capab = bp;
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if ((file = getenv("TERMCAP")) != (char*)NULL)
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{
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if (*file != '/' && (cp = getenv("TERM")) != NULL && strcmp(name, cp) == 0)
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{
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(void)strcpy(bp, file);
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return (1);
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}
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else
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file = "/etc/termcap";
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}
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else
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file = "/etc/termcap";
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if ((fp = fopen(file, "r")) == (FILE*)NULL)
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return (-1);
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while (fgets(buf, 1024, fp) != NULL)
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{
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if (buf[0] == '#')
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continue;
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while (*(cp = &buf[strlen(buf) - 2]) == '\\')
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if (fgets(cp, 1024, fp) == NULL)
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goto exit;
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if (match_name(buf, name))
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{
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strcpy(bp, buf);
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fclose(fp);
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return (check_for_tc());
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}
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}
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exit:
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fclose(fp);
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return (0);
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}
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/*
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* Compare the terminal name with each termcap entry name; Return 1 if a
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* match is found.
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*/
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static int
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match_name(const char* buf, const char* name)
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{
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register const char* tp = buf;
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register const char* np;
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for (;;)
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{
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for (np = name; *np && *tp == *np; np++, tp++)
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{
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}
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if (*np == 0 && (*tp == '|' || *tp == ':' || *tp == 0))
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return (1);
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while (*tp != 0 && *tp != '|' && *tp != ':')
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tp++;
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if (*tp++ != '|')
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return (0);
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}
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}
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/*
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* Handle tc= definitions recursively.
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*/
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static int
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check_for_tc(void)
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{
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static int count = 0;
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const char* savcapab = capab;
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char buf[1024];
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char terminalname[128];
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register char *p = (char*)capab + strlen(capab) - 2, *q;
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while (*p != ':')
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if (--p < (char*)capab)
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return (0); /* no : in termcap entry */
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if (p[1] != 't' || p[2] != 'c')
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return (1);
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if (count > 16)
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return (0); /* recursion in tc= definitions */
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count++;
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strcpy(terminalname, &p[4]);
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q = terminalname;
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while (*q && *q != ':')
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q++;
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*q = 0;
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if (tgetent(buf, terminalname) != 1)
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{
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--count;
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return (0);
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}
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--count;
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for (q = buf; *q && *q != ':'; q++)
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{
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}
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strcpy(p, q);
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capab = savcapab;
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return (1);
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}
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/*
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* tgetnum - get the numeric terminal capability corresponding
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* to id. Returns the value, -1 if invalid.
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*/
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int tgetnum(const char* id)
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{
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const char* cp;
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int ret;
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if ((cp = capab) == NULL || id == NULL)
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return (-1);
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while (*++cp != ':')
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;
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while (*cp)
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{
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cp++;
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while (ISSPACE(*cp))
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cp++;
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if (strncmp(cp, id, CAPABLEN) == 0)
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{
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while (*cp && *cp != ':' && *cp != '#')
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cp++;
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if (*cp != '#')
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return (-1);
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for (ret = 0, cp++; *cp && ISDIGIT(*cp); cp++)
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ret = ret * 10 + *cp - '0';
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return (ret);
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}
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while (*cp && *cp != ':')
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cp++;
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}
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return (-1);
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}
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/*
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* tgetflag - get the boolean flag corresponding to id. Returns -1
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* if invalid, 0 if the flag is not in termcap entry, or 1 if it is
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* present.
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*/
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int tgetflag(const char* id)
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{
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const char* cp;
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if ((cp = capab) == NULL || id == NULL)
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return (-1);
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while (*++cp != ':')
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;
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while (*cp)
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{
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cp++;
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while (ISSPACE(*cp))
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cp++;
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if (strncmp(cp, id, CAPABLEN) == 0)
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return (1);
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while (*cp && *cp != ':')
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cp++;
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}
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return (0);
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}
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/*
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* tgetstr - get the string capability corresponding to id and place
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* it in area (advancing area at same time). Expand escape sequences
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* etc. Returns the string, or NULL if it can't do it.
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*/
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char* tgetstr(const char* id, char** const area)
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{
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const char* cp;
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char* ret;
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int i;
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if ((cp = capab) == NULL || id == NULL)
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return (NULL);
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while (*++cp != ':')
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;
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while (*cp)
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{
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cp++;
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while (ISSPACE(*cp))
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cp++;
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if (strncmp(cp, id, CAPABLEN) == 0)
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{
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while (*cp && *cp != ':' && *cp != '=')
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cp++;
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if (*cp != '=')
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return (NULL);
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for (ret = *area, cp++; *cp && *cp != ':'; (*area)++, cp++)
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switch (*cp)
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{
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case '^':
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**area = *++cp - 'A' + 1;
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break;
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case '\\':
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switch (*++cp)
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{
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case 'E':
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**area = '\033';
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break;
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case 'n':
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**area = '\n';
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break;
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case 'r':
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**area = '\r';
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break;
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case 't':
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**area = '\t';
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break;
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case 'b':
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**area = '\b';
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break;
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case 'f':
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**area = '\f';
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break;
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case '0':
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case '1':
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case '2':
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case '3':
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for (i = 0; *cp && ISDIGIT(*cp); cp++)
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i = i * 8 + *cp - '0';
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**area = i;
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cp--;
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break;
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case '^':
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case '\\':
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**area = *cp;
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break;
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}
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break;
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default:
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**area = *cp;
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}
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*(*area)++ = '\0';
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return (ret);
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}
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while (*cp && *cp != ':')
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cp++;
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}
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return (NULL);
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}
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/*
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* tgoto - given the cursor motion string cm, make up the string
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* for the cursor to go to (destcol, destline), and return the string.
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* Returns "OOPS" if something's gone wrong, or the string otherwise.
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*/
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char* tgoto(const char* cm, int destcol, int destline)
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{
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register char* rp;
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static char ret[24];
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char added[16];
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int* dp = &destline;
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int numval;
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int swapped = 0;
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added[0] = 0;
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for (rp = ret; *cm; cm++)
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{
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if (*cm == '%')
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{
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switch (*++cm)
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{
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case '>':
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if (dp == NULL)
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return ("OOPS");
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cm++;
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if (*dp > *cm++)
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{
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*dp += *cm;
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}
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break;
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case '+':
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case '.':
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if (dp == NULL)
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return ("OOPS");
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if (*cm == '+')
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*dp = *dp + *++cm;
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for (;;)
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{
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switch (*dp)
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{
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case 0:
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case 04:
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case '\t':
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case '\n':
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/* filter these out */
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if (dp == &destcol || swapped || UP)
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{
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strcat(added, dp == &destcol || swapped ? (BC ? BC : "\b") : UP);
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(*dp)++;
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continue;
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}
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}
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break;
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}
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*rp++ = *dp;
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dp = (dp == &destline) ? &destcol : NULL;
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break;
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case 'r':
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{
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int tmp = destline;
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destline = destcol;
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destcol = tmp;
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swapped = 1 - swapped;
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break;
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}
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case 'n':
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destcol ^= 0140;
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destline ^= 0140;
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break;
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case '%':
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*rp++ = '%';
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break;
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case 'i':
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destcol++;
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destline++;
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break;
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case 'B':
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if (dp == NULL)
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return ("OOPS");
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*dp = 16 * (*dp / 10) + *dp % 10;
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break;
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case 'D':
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if (dp == NULL)
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return ("OOPS");
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*dp = *dp - 2 * (*dp % 16);
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break;
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case 'd':
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case '2':
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case '3':
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if (dp == NULL)
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return ("OOPS");
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numval = *dp;
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dp = (dp == &destline) ? &destcol : NULL;
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if (numval >= 100)
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{
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*rp++ = '0' + numval / 100;
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}
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else if (*cm == '3')
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{
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*rp++ = ' ';
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}
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if (numval >= 10)
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{
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*rp++ = '0' + ((numval % 100) / 10);
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}
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else if (*cm == '3' || *cm == '2')
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{
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*rp++ = ' ';
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}
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*rp++ = '0' + (numval % 10);
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break;
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default:
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return ("OOPS");
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}
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}
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else
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*rp++ = *cm;
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}
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*rp = '\0';
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strcpy(rp, added);
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return (ret);
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}
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static int tens_of_ms_p_char[] = { /* index as returned by gtty */
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/* assume 10 bits per char */
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0, 2000, 1333, 909, 743, 666, 500, 333, 166, 83, 55, 41, 20, 10, 5, 2
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};
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/*
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* tputs - put the string cp out onto the terminal, using the function
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* outc. Also handle padding.
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*/
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int tputs(register const char* cp, int affcnt, int (*outc)(int))
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{
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int delay = 0;
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if (cp == NULL)
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return (1);
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while (ISDIGIT(*cp))
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{
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delay = delay * 10 + (*cp++ - '0');
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}
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delay *= 10;
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if (*cp == '.')
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{
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cp++;
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if (ISDIGIT(*cp))
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{
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delay += *cp++ - '0';
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}
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while (ISDIGIT(*cp))
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cp++;
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}
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if (*cp == '*')
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{
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delay *= affcnt;
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cp++;
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}
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while (*cp)
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(*outc)(*cp++);
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if (delay != 0 && ospeed > 0 && ospeed < (sizeof tens_of_ms_p_char / sizeof tens_of_ms_p_char[0]))
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{
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delay = (delay + tens_of_ms_p_char[ospeed] - 1) / tens_of_ms_p_char[ospeed];
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while (delay--)
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(*outc)(PC);
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}
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return (1);
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}
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/*
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* That's all, folks...
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*/
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