| 189 |
|
|
| 190 |
|
if (ctx == NULL) |
| 191 |
|
return(context); /* just asking */ |
| 192 |
+ |
while (*ctx == CNTXMARK) |
| 193 |
+ |
ctx++; /* skip past marks */ |
| 194 |
|
if (!*ctx) { |
| 195 |
< |
context[0] = '\0'; /* clear context */ |
| 195 |
> |
context[0] = '\0'; /* empty means clear context */ |
| 196 |
|
return(context); |
| 197 |
|
} |
| 198 |
< |
cpp = context; /* else copy it (carefully!) */ |
| 199 |
< |
if (*ctx != CNTXMARK) |
| 200 |
< |
*cpp++ = CNTXMARK; /* make sure there's a mark */ |
| 199 |
< |
do { |
| 198 |
> |
cpp = context; /* start context with mark */ |
| 199 |
> |
*cpp++ = CNTXMARK; |
| 200 |
> |
do { /* carefully copy new context */ |
| 201 |
|
if (cpp >= context+MAXWORD) |
| 202 |
|
break; /* just copy what we can */ |
| 203 |
|
if (isid(*ctx)) |
| 206 |
|
*cpp++ = '_'; ctx++; |
| 207 |
|
} |
| 208 |
|
} while (*ctx); |
| 209 |
+ |
while (cpp[-1] == CNTXMARK) /* cannot end in context mark */ |
| 210 |
+ |
cpp--; |
| 211 |
|
*cpp = '\0'; |
| 212 |
+ |
return(context); |
| 213 |
+ |
} |
| 214 |
+ |
|
| 215 |
+ |
|
| 216 |
+ |
char * |
| 217 |
+ |
pushcontext(ctx) /* push on another context */ |
| 218 |
+ |
char *ctx; |
| 219 |
+ |
{ |
| 220 |
+ |
extern char *strncpy(), *strcpy(); |
| 221 |
+ |
char oldcontext[MAXWORD+1]; |
| 222 |
+ |
register int n; |
| 223 |
+ |
|
| 224 |
+ |
strcpy(oldcontext, context); /* save old context */ |
| 225 |
+ |
setcontext(ctx); /* set new context */ |
| 226 |
+ |
n = strlen(context); /* tack on old */ |
| 227 |
+ |
if (n+strlen(oldcontext) > MAXWORD) { |
| 228 |
+ |
strncpy(context+n, oldcontext, MAXWORD-n); |
| 229 |
+ |
context[MAXWORD] = '\0'; |
| 230 |
+ |
} else |
| 231 |
+ |
strcpy(context+n, oldcontext); |
| 232 |
+ |
return(context); |
| 233 |
+ |
} |
| 234 |
+ |
|
| 235 |
+ |
|
| 236 |
+ |
char * |
| 237 |
+ |
popcontext() /* pop off top context */ |
| 238 |
+ |
{ |
| 239 |
+ |
register char *cp1, *cp2; |
| 240 |
+ |
|
| 241 |
+ |
if (!context[0]) /* nothing left to pop */ |
| 242 |
+ |
return(context); |
| 243 |
+ |
cp2 = context; /* find mark */ |
| 244 |
+ |
while (*++cp2 && *cp2 != CNTXMARK) |
| 245 |
+ |
; |
| 246 |
+ |
cp1 = context; /* copy tail to front */ |
| 247 |
+ |
while (*cp1++ = *cp2++) |
| 248 |
+ |
; |
| 249 |
|
return(context); |
| 250 |
|
} |
| 251 |
|
|
