sptr             1238 src/string.c       const char *sptr, *ptr, *eptr;
sptr             1246 src/string.c           sptr = SCM_STRING_BODY_START(srcb) + start;
sptr             1247 src/string.c           ptr = sptr + index;
sptr             1250 src/string.c           sptr = forward_pos(SCM_STRING_BODY_START(srcb), start);
sptr             1251 src/string.c           ptr = forward_pos(sptr, index);
sptr             1252 src/string.c           eptr = forward_pos(sptr, end - start);
sptr             1259 src/string.c       sp->start = sptr;