From: Behdad Esfahbod Date: Tue, 10 Feb 2009 23:57:34 +0000 (-0500) Subject: [fcformat] Refactor code to avoid malloc X-Git-Tag: 2.7.0~88 X-Git-Url: https://git.wh0rd.org/?a=commitdiff_plain;h=85c7fb67ce9f77574f71de7d9b69867bb974cd48;p=fontconfig.git [fcformat] Refactor code to avoid malloc --- diff --git a/src/fcformat.c b/src/fcformat.c index 1d67a9d..4473009 100644 --- a/src/fcformat.c +++ b/src/fcformat.c @@ -54,15 +54,28 @@ typedef struct _FcFormatContext const FcChar8 *format; int format_len; FcChar8 *word; + FcBool word_allocated; } FcFormatContext; static FcBool FcFormatContextInit (FcFormatContext *c, - const FcChar8 *format) + const FcChar8 *format, + FcChar8 *scratch, + int scratch_len) { c->format_orig = c->format = format; c->format_len = strlen ((const char *) format); - c->word = malloc (c->format_len + 1); + + if (c->format_len < scratch_len) + { + c->word = scratch; + c->word_allocated = FcFalse; + } + else + { + c->word = malloc (c->format_len + 1); + c->word_allocated = FcTrue; + } return c->word != NULL; } @@ -70,7 +83,7 @@ FcFormatContextInit (FcFormatContext *c, static void FcFormatContextDone (FcFormatContext *c) { - if (c) + if (c && c->word_allocated) { free (c->word); } @@ -163,7 +176,7 @@ read_word (FcFormatContext *c) if (p == c->word) { - message ("expected element name at %d", + message ("expected identifier at %d", c->format - c->format_orig + 1); return FcFalse; } @@ -216,11 +229,13 @@ interpret_builtin (FcFormatContext *c, #define BUILTIN(name, func) \ else if (0 == strcmp ((const char *) c->word, name))\ return func (c, pat, buf) +#if 0 BUILTIN ("unparse", FcNameUnparse); BUILTIN ("verbose", FcPatternPrint); BUILTIN2 ("fcmatch", FcStrDirname); BUILTIN2 ("fclist", FcStrDirname); BUILTIN2 ("pkgkit", FcStrDirname); +#endif message ("unknown builtin \"%s\"", c->word); @@ -518,83 +533,74 @@ interpret_simple (FcFormatContext *c, return FcTrue; } -static FcChar8 * -cescape (const FcChar8 *str) +static FcBool +cescape (FcFormatContext *c, + FcStrBuf *buf, + const FcChar8 *str) { - FcStrBuf buf; - FcChar8 buf_static[8192]; - - FcStrBufInit (&buf, buf_static, sizeof (buf_static)); while(*str) { switch (*str) { case '\\': case '"': - FcStrBufChar (&buf, '\\'); + FcStrBufChar (buf, '\\'); break; } - FcStrBufChar (&buf, *str++); + FcStrBufChar (buf, *str++); } - return FcStrBufDone (&buf); + return FcTrue; } -static FcChar8 * -shescape (const FcChar8 *str) +static FcBool +shescape (FcFormatContext *c, + FcStrBuf *buf, + const FcChar8 *str) { - FcStrBuf buf; - FcChar8 buf_static[8192]; - - FcStrBufInit (&buf, buf_static, sizeof (buf_static)); - FcStrBufChar (&buf, '\''); + FcStrBufChar (buf, '\''); while(*str) { if (*str == '\'') - FcStrBufString (&buf, (const FcChar8 *) "'\\''"); + FcStrBufString (buf, (const FcChar8 *) "'\\''"); else - FcStrBufChar (&buf, *str); + FcStrBufChar (buf, *str); str++; } - FcStrBufChar (&buf, '\''); - return FcStrBufDone (&buf); + FcStrBufChar (buf, '\''); + return FcTrue; } -static FcChar8 * -xmlescape (const FcChar8 *str) +static FcBool +xmlescape (FcFormatContext *c, + FcStrBuf *buf, + const FcChar8 *str) { - FcStrBuf buf; - FcChar8 buf_static[8192]; - - FcStrBufInit (&buf, buf_static, sizeof (buf_static)); while(*str) { switch (*str) { - case '&': FcStrBufString (&buf, (const FcChar8 *) "&"); break; - case '<': FcStrBufString (&buf, (const FcChar8 *) "<"); break; - case '>': FcStrBufString (&buf, (const FcChar8 *) ">"); break; - default: FcStrBufChar (&buf, *str); break; + case '&': FcStrBufString (buf, (const FcChar8 *) "&"); break; + case '<': FcStrBufString (buf, (const FcChar8 *) "<"); break; + case '>': FcStrBufString (buf, (const FcChar8 *) ">"); break; + default: FcStrBufChar (buf, *str); break; } str++; } - return FcStrBufDone (&buf); + return FcTrue; } -static FcChar8 * +static FcBool delete_chars (FcFormatContext *c, + FcStrBuf *buf, const FcChar8 *str) { - FcStrBuf buf; - FcChar8 buf_static[8192]; - /* XXX not UTF-8 aware */ if (!expect_char (c, '(') || !read_chars (c, ')') || !expect_char (c, ')')) - return NULL; + return FcFalse; - FcStrBufInit (&buf, buf_static, sizeof (buf_static)); while(*str) { FcChar8 *p; @@ -602,34 +608,32 @@ delete_chars (FcFormatContext *c, p = (FcChar8 *) strpbrk ((const char *) str, (const char *) c->word); if (p) { - FcStrBufData (&buf, str, p - str); + FcStrBufData (buf, str, p - str); str = p + 1; } else { - FcStrBufString (&buf, str); + FcStrBufString (buf, str); break; } } - return FcStrBufDone (&buf); + + return FcTrue; } -static FcChar8 * +static FcBool escape_chars (FcFormatContext *c, + FcStrBuf *buf, const FcChar8 *str) { - FcStrBuf buf; - FcChar8 buf_static[8192]; - /* XXX not UTF-8 aware */ if (!expect_char (c, '(') || !read_chars (c, ')') || !expect_char (c, ')')) - return NULL; + return FcFalse; - FcStrBufInit (&buf, buf_static, sizeof (buf_static)); while(*str) { FcChar8 *p; @@ -637,27 +641,27 @@ escape_chars (FcFormatContext *c, p = (FcChar8 *) strpbrk ((const char *) str, (const char *) c->word); if (p) { - FcStrBufData (&buf, str, p - str); - FcStrBufChar (&buf, c->word[0]); - FcStrBufChar (&buf, *p); + FcStrBufData (buf, str, p - str); + FcStrBufChar (buf, c->word[0]); + FcStrBufChar (buf, *p); str = p + 1; } else { - FcStrBufString (&buf, str); + FcStrBufString (buf, str); break; } } - return FcStrBufDone (&buf); + + return FcTrue; } -static FcChar8 * +static FcBool translate_chars (FcFormatContext *c, + FcStrBuf *buf, const FcChar8 *str) { - FcStrBuf buf; - FcChar8 buf_static[8192]; char *from, *to, repeat; int from_len, to_len; @@ -666,7 +670,7 @@ translate_chars (FcFormatContext *c, if (!expect_char (c, '(') || !read_chars (c, ',') || !expect_char (c, ',')) - return NULL; + return FcFalse; from = (char *) c->word; from_len = strlen (from); @@ -687,7 +691,6 @@ translate_chars (FcFormatContext *c, if (!expect_char (c, ')')) return FcFalse; - FcStrBufInit (&buf, buf_static, sizeof (buf_static)); while(*str) { FcChar8 *p; @@ -696,46 +699,100 @@ translate_chars (FcFormatContext *c, if (p) { int i; - FcStrBufData (&buf, str, p - str); + FcStrBufData (buf, str, p - str); i = strchr (from, *p) - from; - FcStrBufChar (&buf, i < to_len ? to[i] : repeat); + FcStrBufChar (buf, i < to_len ? to[i] : repeat); str = p + 1; } else { - FcStrBufString (&buf, str); + FcStrBufString (buf, str); break; } } - return FcStrBufDone (&buf); + + return FcTrue; } -static FcChar8 * -convert (FcFormatContext *c, - const FcChar8 *str) +static FcBool +interpret_convert (FcFormatContext *c, + FcStrBuf *buf, + int start) { + const FcChar8 *str; + FcChar8 *new_str; + FcStrBuf new_buf; + FcChar8 buf_static[8192]; + FcBool ret; + + if (!expect_char (c, '|')) + return FcFalse; + + /* nul-terminate the buffer */ + FcStrBufChar (buf, '\0'); + if (buf->failed) + return FcFalse; + str = buf->buf + start; + buf->len = start; + if (!read_word (c)) - return NULL; + return FcFalse; + + /* try simple converters first */ + if (0) { } #define CONVERTER(name, func) \ else if (0 == strcmp ((const char *) c->word, name))\ - return func (str) -#define CONVERTER2(name, func) \ - else if (0 == strcmp ((const char *) c->word, name))\ - return func (c, str) + do { new_str = func (str); ret = FcTrue; } while (0) CONVERTER ("downcase", FcStrDowncase); CONVERTER ("basename", FcStrBasename); CONVERTER ("dirname", FcStrDirname); - CONVERTER ("cescape", cescape); - CONVERTER ("shescape", shescape); - CONVERTER ("xmlescape", xmlescape); - CONVERTER2 ("delete", delete_chars); - CONVERTER2 ("escape", escape_chars); - CONVERTER2 ("translate", translate_chars); - - message ("unknown converter \"%s\"", - c->word); - return NULL; +#undef CONVERTER + else + ret = FcFalse; + + if (ret) + { + if (new_str) + { + /* replace in the buffer */ + FcStrBufString (buf, new_str); + free (new_str); + return FcTrue; + } + else + return FcFalse; + } + + FcStrBufInit (&new_buf, buf_static, sizeof (buf_static)); + + /* now try our custom converters */ + if (0) { } +#define CONVERTER(name, func) \ + else if (0 == strcmp ((const char *) c->word, name))\ + ret = func (c, &new_buf, str) + CONVERTER ("cescape", cescape); + CONVERTER ("shescape", shescape); + CONVERTER ("xmlescape", xmlescape); + CONVERTER ("delete", delete_chars); + CONVERTER ("escape", escape_chars); + CONVERTER ("translate", translate_chars); +#undef CONVERTER + else + ret = FcFalse; + + if (ret) + { + FcStrBufChar (&new_buf, '\0'); + FcStrBufString (buf, new_buf.buf); + } + else + message ("unknown converter \"%s\"", + c->word); + + FcStrBufDestroy (&new_buf); + + return ret; } static FcBool @@ -743,26 +800,10 @@ maybe_interpret_converts (FcFormatContext *c, FcStrBuf *buf, int start) { - while (consume_char (c, '|')) - { - const FcChar8 *str; - FcChar8 *new_str; - - /* nul-terminate the buffer */ - FcStrBufChar (buf, '\0'); - if (buf->failed) - return FcFalse; - str = buf->buf + start; - - if (!(new_str = convert (c, str))) + while (*c->format == '|') + if (!interpret_convert (c, buf, start)) return FcFalse; - /* replace in the buffer */ - buf->len = start; - FcStrBufString (buf, new_str); - free (new_str); - } - return FcTrue; } @@ -873,12 +914,13 @@ FcChar8 * FcPatternFormat (FcPattern *pat, const FcChar8 *format) { FcStrBuf buf; - FcChar8 buf_static[8192]; + FcChar8 word_static[1024]; + FcChar8 buf_static[8192 - 1024]; FcFormatContext c; FcBool ret; FcStrBufInit (&buf, buf_static, sizeof (buf_static)); - if (!FcFormatContextInit (&c, format)) + if (!FcFormatContextInit (&c, format, word_static, sizeof (word_static))) return NULL; ret = interpret_expr (&c, pat, &buf, '\0');