UNIX — универсальная среда программирования - Керниган Брайан Уилсон
}
defnonly(s) /* warn if illegal definition */
char *s;
{
if (!indef)
execerror(s, "used outside definition");
}
yyerror(s) /* report compile-time error */
char *s;
{
warning(s, (char *)0);
}
execerror(s, t) /* recover from run-time error */
char *s, *t;
{
warning(s, t);
fseek(fin, 0L, 2); /* flush rest of file */
longjmp(begin, 0);
}
fpecatch() /* catch floating point exceptions */
{
execerror("floating point exception", (char*)0);
}
main(argc, argv) /* hoc6 */
char *argv[];
{
int i, fpecatch();
progname = argv[0];
if (argc == 1) { /* fake an argument list */
static char *stdinonly[] = { "-" };
gargv = stdinonly;
gargc = 1;
} else {
gargv = argv+1;
gargc = argc-1;
}
init();
while (moreinput())
run();
return 0;
}
moreinput() {
if (gargc-- <= 0)
return 0;
if (fin && fin != stdin)
fclose(fin);
infile = *gargv++;
lineno = 1;
if (strcmp(infile, "-") == 0) {
fin = stdin;
infile = 0;
} else if ((fin=fopen(infile, "r")) == NULL) {
fprintf (stderr, "%s: can't open %sn", progname, infile);
return moreinput();
}
return 1;
}
run() /* execute until EOF */
{
setjmp(begin);
signal(SIGFPE, fpecatch);
for (initcode(); yyparse(); initcode())
execute(progbase);
}
warning(s, t) /* print warning message */
char *s, *t;
{
fprintf(stderr, "%s: %s", progname, s);
if (t)
fprintf(stderr, " %s", t);
if (infile)
fprintf(stderr, " in %s", infile);
fprintf(stderr, " near line %dn", lineno);
while (c != 'n' && c != EOF)
с = getc(fin); /* flush rest of input line */
if (c == 'n')
lineno++;
}
3.7.15 init.c
#include "hoc.h"
#include "y.tab.h"
#include <math.h>
extern double Log(), Log10(), Sqrt(), Exp(), integer();
static struct { /* Keywords */
char *name;
int kval;
} keywords[] = {
"proc", PROC,
"func", FUNC,
"return", RETURN,
"if", IF,
"else", ELSE,
"while", WHILE,
"print", PRINT,
"read", READ,
0, 0,
};
static struct { /* Constants */
char *name;
double eval;
} consts[] = {
"PI", 3.14159265358979323846,
"E", 2.71828182845904523536,
"GAMMA", 0.57721566490153286060, /* Euler */
"DEG", 57.29577951308232087680, /* deg/radian */
