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- /* unixstuff.c - unix specific routines */
-
- #include "xscheme.h"
-
- #define LBSIZE 200
-
- /* external variables */
- extern LVAL s_unbound,true;
- extern FILE *tfp;
- extern int errno;
-
- /* local variables */
- static char lbuf[LBSIZE];
- /* static int lpos[LBSIZE]; */
- static int lindex;
- static int lcount;
- static long rseed = 1L;
-
- /* osinit - initialize */
- osinit(banner)
- char *banner;
- {
- printf("%s\n",banner);
- lindex = 0;
- lcount = 0;
- }
-
- /* osfinish - clean up before returning to the operating system */
- osfinish()
- {
- }
-
- /* oserror - print an error message */
- oserror(msg)
- char *msg;
- {
- printf("error: %s\n",msg);
- }
-
- /* osrand - return a random number between 0 and n-1 */
- int osrand(n)
- int n;
- {
- long k1;
-
- /* make sure we don't get stuck at zero */
- if (rseed == 0L) rseed = 1L;
-
- /* algorithm taken from Dr. Dobbs Journal, November 1985, page 91 */
- k1 = rseed / 127773L;
- if ((rseed = 16807L * (rseed - k1 * 127773L) - k1 * 2836L) < 0L)
- rseed += 2147483647L;
-
- /* return a random number between 0 and n-1 */
- return ((int)(rseed % (long)n));
- }
-
- /* osaopen - open an ascii file */
- FILE *osaopen(name,mode)
- char *name,*mode;
- {
- return (fopen(name,mode));
- }
-
- /* osbopen - open a binary file */
- FILE *osbopen(name,mode)
- char *name,*mode;
- {
- return (fopen(name,mode));
- }
-
- /* osclose - close a file */
- int osclose(fp)
- FILE *fp;
- {
- return (fclose(fp));
- }
-
- /* ostell - get the current file position */
- long ostell(fp)
- FILE *fp;
- {
- return (ftell(fp));
- }
-
- /* osseek - set the current file position */
- int osseek(fp,offset,whence)
- FILE *fp; long offset; int whence;
- {
- return (fseek(fp,offset,whence));
- }
-
- /* osagetc - get a character from an ascii file */
- int osagetc(fp)
- FILE *fp;
- {
- return (getc(fp));
- }
-
- /* osaputc - put a character to an ascii file */
- int osaputc(ch,fp)
- int ch; FILE *fp;
- {
- return (putc(ch,fp));
- }
-
- /* osbgetc - get a character from a binary file */
- int osbgetc(fp)
- FILE *fp;
- {
- return (getc(fp));
- }
-
- /* osbputc - put a character to a binary file */
- int osbputc(ch,fp)
- int ch; FILE *fp;
- {
- return (putc(ch,fp));
- }
-
- /* ostgetc - get a character from the terminal */
- int ostgetc()
- {
- /* int ch; */
-
- /* check for a buffered character */
- if (lcount--)
- return (lbuf[lindex++]);
-
- /* get an input line */
- do {
- fgets(lbuf,LBSIZE,stdin);
- } while ((lcount = strlen(lbuf)) == 0);
-
- /* write it to the transcript file */
- if (tfp)
- for (lindex = 0; lindex < lcount; ++lindex)
- osaputc(lbuf[lindex],tfp);
- lindex = 0; lcount--;
-
- /* return the first character */
- return (lbuf[lindex++]);
- }
-
- /* ostputc - put a character to the terminal */
- ostputc(ch)
- int ch;
- {
- /* check for control characters */
- oscheck();
-
- /* output the character */
- putchar(ch);
-
- /* output the character to the transcript file */
- if (tfp)
- osaputc(ch,tfp);
- }
-
- /* osflush - flush the terminal input buffer */
- osflush()
- {
- lindex = lcount = 0;
- }
-
- /* oscheck - check for control characters during execution */
- oscheck()
- {
- }
-
- /* xsystem - execute a system command */
- LVAL xsystem()
- {
- char *cmd="sh";
- if (moreargs())
- cmd = (char *)getstring(xlgastring());
- xllastarg();
- return (system(cmd) == 0 ? true : cvfixnum((FIXTYPE)errno));
- }
-
- /* ossymbols - enter os specific symbols */
- ossymbols()
- {
- }
-