diff options
| -rw-r--r-- | bin/man1/order.1 | 4 | ||||
| -rw-r--r-- | bin/order.y | 121 |
2 files changed, 63 insertions, 62 deletions
diff --git a/bin/man1/order.1 b/bin/man1/order.1 index 8e0f9661..89fcbda5 100644 --- a/bin/man1/order.1 +++ b/bin/man1/order.1 @@ -19,8 +19,8 @@ according to the precedence rules in If no .Ar expr are given, -each line of standard input -is parsed and printed. +an expression is read +from standard input. . .Sh EXAMPLES .Bd -literal diff --git a/bin/order.y b/bin/order.y index b4b40a34..b3cbf2df 100644 --- a/bin/order.y +++ b/bin/order.y @@ -24,12 +24,6 @@ #include <string.h> #include <sysexits.h> -int vasprintf(char **ret, const char *format, va_list ap); - -static void yyerror(const char *str) { - errx(EX_DATAERR, "%s", str); -} - #define YYSTYPE char * static char *fmt(const char *format, ...) { @@ -43,9 +37,12 @@ static char *fmt(const char *format, ...) { } static int yylex(void); +static void yyerror(const char *str); %} +%token Ident + %left ',' %right '=' MulAss DivAss ModAss AddAss SubAss ShlAss ShrAss AndAss XorAss OrAss %right '?' ':' @@ -62,8 +59,6 @@ static int yylex(void); %right '!' '~' Inc Dec Sizeof %left '(' ')' '[' ']' Arr '.' -%token Var - %% start: @@ -71,11 +66,11 @@ start: ; expr: - Var + Ident | '(' expr ')' { $$ = $2; } | expr '[' expr ']' { $$ = fmt("(%s[%s])", $1, $3); } - | expr Arr Var { $$ = fmt("(%s->%s)", $1, $3); } - | expr '.' Var { $$ = fmt("(%s.%s)", $1, $3); } + | expr Arr Ident { $$ = fmt("(%s->%s)", $1, $3); } + | expr '.' Ident { $$ = fmt("(%s.%s)", $1, $3); } | '!' expr { $$ = fmt("(!%s)", $2); } | '~' expr { $$ = fmt("(~%s)", $2); } | Inc expr { $$ = fmt("(++%s)", $2); } @@ -128,67 +123,73 @@ ass: #define T(a, b) ((int)(a) << 8 | (int)(b)) -static const char *input; +static FILE *in; static int yylex(void) { - while (isspace(input[0])) input++; - if (!input[0]) return EOF; - - int len; - for (len = 0; isalnum(input[len]) || input[len] == '_'; ++len); - if (len) { - if (!strncmp(input, "sizeof", len)) { - input += len; - return Sizeof; + char ch; + while (isspace(ch = getc(in))); + + if (isalnum(ch)) { + char ident[64] = { ch, '\0' }; + for (size_t i = 1; i < sizeof(ident) - 1; ++i) { + ch = getc(in); + if (!isalnum(ch) && ch != '_') break; + ident[i] = ch; } - yylval = fmt("%.*s", len, input); - input += len; - return Var; - } - - int tok; - switch (T(input[0], input[1])) { - break; case T('-', '>'): tok = Arr; - break; case T('+', '+'): tok = Inc; - break; case T('-', '-'): tok = Dec; - break; case T('<', '<'): tok = Shl; - break; case T('>', '>'): tok = Shr; - break; case T('<', '='): tok = Le; - break; case T('>', '='): tok = Ge; - break; case T('=', '='): tok = Eq; - break; case T('!', '='): tok = Ne; - break; case T('&', '&'): tok = And; - break; case T('|', '|'): tok = Or; - break; case T('*', '='): tok = MulAss; - break; case T('/', '='): tok = DivAss; - break; case T('%', '='): tok = ModAss; - break; case T('+', '='): tok = AddAss; - break; case T('-', '='): tok = SubAss; - break; case T('&', '='): tok = AndAss; - break; case T('^', '='): tok = XorAss; - break; case T('|', '='): tok = OrAss; - break; default: return *input++; + ungetc(ch, in); + if (!strcmp(ident, "sizeof")) return Sizeof; + yylval = fmt("%s", ident); + return Ident; } - input += 2; - switch (T(tok, input[0])) { - case T(Shl, '='): input++; return ShlAss; - case T(Shr, '='): input++; return ShrAss; + char ne = getc(in); + switch (T(ch, ne)) { + case T('-', '>'): return Arr; + case T('+', '+'): return Inc; + case T('-', '-'): return Dec; + case T('<', '='): return Le; + case T('>', '='): return Ge; + case T('=', '='): return Eq; + case T('!', '='): return Ne; + case T('&', '&'): return And; + case T('|', '|'): return Or; + case T('*', '='): return MulAss; + case T('/', '='): return DivAss; + case T('%', '='): return ModAss; + case T('+', '='): return AddAss; + case T('-', '='): return SubAss; + case T('&', '='): return AndAss; + case T('^', '='): return XorAss; + case T('|', '='): return OrAss; + case T('<', '<'): { + if ('=' == (ne = getc(in))) return ShlAss; + ungetc(ne, in); + return Shl; + } + case T('>', '>'): { + if ('=' == (ne = getc(in))) return ShrAss; + ungetc(ne, in); + return Shr; + } + default: { + ungetc(ne, in); + return ch; + } } +} - return tok; +static void yyerror(const char *str) { + errx(EX_DATAERR, "%s", str); } int main(int argc, char *argv[]) { for (int i = 1; i < argc; ++i) { - input = argv[i]; + in = fmemopen(argv[i], strlen(argv[i]), "r"); + if (!in) err(EX_OSERR, "fmemopen"); yyparse(); + fclose(in); } if (argc > 1) return EX_OK; - size_t cap = 0; - char *buf = NULL; - while (0 < getline(&buf, &cap, stdin)) { - input = buf; - yyparse(); - } + in = stdin; + yyparse(); } |