diff options
Diffstat (limited to 'src/system.h')
| -rw-r--r-- | src/system.h | 59 |
1 files changed, 44 insertions, 15 deletions
diff --git a/src/system.h b/src/system.h index bbdf9fd0..630ef646 100644 --- a/src/system.h +++ b/src/system.h @@ -204,24 +204,53 @@ max_int (int a, int b) } while (0) -/* Output Str escaped for our postprocessing (i.e., escape M4 special +/* Output CP escaped for our postprocessing (i.e., escape M4 special characters). - For instance "[foo]" -> "@{foo@}", "$$" -> "$][$][". */ + For instance "[foo]" -> "@{foo@}", "$$" -> "$][$][". -# define obstack_escape(Obs, Str) \ - do { \ - char const *p__; \ - for (p__ = Str; *p__; p__++) \ - switch (*p__) \ - { \ - case '$': obstack_sgrow (Obs, "$]["); break; \ - case '@': obstack_sgrow (Obs, "@@" ); break; \ - case '[': obstack_sgrow (Obs, "@{" ); break; \ - case ']': obstack_sgrow (Obs, "@}" ); break; \ - default: obstack_1grow (Obs, *p__ ); break; \ - } \ - } while (0) + All the user's input passed to m4 is processed by this function or + by output_escaped, except user actions. Because of the specific + handling of @$, @1, etc., user actions are processed (and escaped) + by scan-code.l. + + Keep output_escaped and obstack_escape sync'ed. + */ + +static inline void +obstack_escape (struct obstack* obs, const char *cp) +{ + for (; *cp; ++cp) + switch (*cp) + { + case '$': obstack_sgrow (obs, "$]["); break; + case '@': obstack_sgrow (obs, "@@" ); break; + case '[': obstack_sgrow (obs, "@{" ); break; + case ']': obstack_sgrow (obs, "@}" ); break; + case 'b': + if (STRPREFIX_LIT ("b4_", cp)) + { + obstack_sgrow (obs, "b4@'_"); + cp += strlen ("b4_") - 1; + break; + } + else + goto append; + + case 'm': + if (STRPREFIX_LIT ("m4_", cp)) + { + obstack_sgrow (obs, "m4@'_"); + cp += strlen ("m4_") - 1; + break; + } + else + goto append; + + append: + default: obstack_1grow (obs, *cp); break; + } +} /* Output Str both quoted for M4 (i.e., embed in [[...]]), and escaped |