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Diffstat (limited to 'wildmatch.c')
| -rw-r--r-- | wildmatch.c | 368 |
1 files changed, 368 insertions, 0 deletions
diff --git a/wildmatch.c b/wildmatch.c new file mode 100644 index 0000000..f3a1731 --- /dev/null +++ b/wildmatch.c @@ -0,0 +1,368 @@ +/* +** Do shell-style pattern matching for ?, \, [], and * characters. +** It is 8bit clean. +** +** Written by Rich $alz, mirror!rs, Wed Nov 26 19:03:17 EST 1986. +** Rich $alz is now <rsalz@bbn.com>. +** +** Modified by Wayne Davison to special-case '/' matching, to make '**' +** work differently than '*', and to fix the character-class code. +*/ + +#include "rsync.h" + +/* What character marks an inverted character class? */ +#define NEGATE_CLASS '!' +#define NEGATE_CLASS2 '^' + +#define FALSE 0 +#define TRUE 1 +#define ABORT_ALL -1 +#define ABORT_TO_STARSTAR -2 + +#define CC_EQ(class, len, litmatch) ((len) == sizeof (litmatch)-1 \ + && *(class) == *(litmatch) \ + && strncmp((char*)class, litmatch, len) == 0) + +#if defined STDC_HEADERS || !defined isascii +# define ISASCII(c) 1 +#else +# define ISASCII(c) isascii(c) +#endif + +#ifdef isblank +# define ISBLANK(c) (ISASCII(c) && isblank(c)) +#else +# define ISBLANK(c) ((c) == ' ' || (c) == '\t') +#endif + +#ifdef isgraph +# define ISGRAPH(c) (ISASCII(c) && isgraph(c)) +#else +# define ISGRAPH(c) (ISASCII(c) && isprint(c) && !isspace(c)) +#endif + +#define ISPRINT(c) (ISASCII(c) && isprint(c)) +#define ISDIGIT(c) (ISASCII(c) && isdigit(c)) +#define ISALNUM(c) (ISASCII(c) && isalnum(c)) +#define ISALPHA(c) (ISASCII(c) && isalpha(c)) +#define ISCNTRL(c) (ISASCII(c) && iscntrl(c)) +#define ISLOWER(c) (ISASCII(c) && islower(c)) +#define ISPUNCT(c) (ISASCII(c) && ispunct(c)) +#define ISSPACE(c) (ISASCII(c) && isspace(c)) +#define ISUPPER(c) (ISASCII(c) && isupper(c)) +#define ISXDIGIT(c) (ISASCII(c) && isxdigit(c)) + +#ifdef WILD_TEST_ITERATIONS +int wildmatch_iteration_count; +#endif + +static int force_lower_case = 0; + +/* Match pattern "p" against the a virtually-joined string consisting + * of "text" and any strings in array "a". */ +static int dowild(const uchar *p, const uchar *text, const uchar*const *a) +{ + uchar p_ch; + +#ifdef WILD_TEST_ITERATIONS + wildmatch_iteration_count++; +#endif + + for ( ; (p_ch = *p) != '\0'; text++, p++) { + int matched, special; + uchar t_ch, prev_ch; + while ((t_ch = *text) == '\0') { + if (*a == NULL) { + if (p_ch != '*') + return ABORT_ALL; + break; + } + text = *a++; + } + if (force_lower_case && ISUPPER(t_ch)) + t_ch = tolower(t_ch); + switch (p_ch) { + case '\\': + /* Literal match with following character. Note that the test + * in "default" handles the p[1] == '\0' failure case. */ + p_ch = *++p; + /* FALLTHROUGH */ + default: + if (t_ch != p_ch) + return FALSE; + continue; + case '?': + /* Match anything but '/'. */ + if (t_ch == '/') + return FALSE; + continue; + case '*': + if (*++p == '*') { + while (*++p == '*') {} + special = TRUE; + } else + special = FALSE; + if (*p == '\0') { + /* Trailing "**" matches everything. Trailing "*" matches + * only if there are no more slash characters. */ + if (!special) { + do { + if (strchr((char*)text, '/') != NULL) + return FALSE; + } while ((text = *a++) != NULL); + } + return TRUE; + } + while (1) { + if (t_ch == '\0') { + if ((text = *a++) == NULL) + break; + t_ch = *text; + continue; + } + if ((matched = dowild(p, text, a)) != FALSE) { + if (!special || matched != ABORT_TO_STARSTAR) + return matched; + } else if (!special && t_ch == '/') + return ABORT_TO_STARSTAR; + t_ch = *++text; + } + return ABORT_ALL; + case '[': + p_ch = *++p; +#ifdef NEGATE_CLASS2 + if (p_ch == NEGATE_CLASS2) + p_ch = NEGATE_CLASS; +#endif + /* Assign literal TRUE/FALSE because of "matched" comparison. */ + special = p_ch == NEGATE_CLASS? TRUE : FALSE; + if (special) { + /* Inverted character class. */ + p_ch = *++p; + } + prev_ch = 0; + matched = FALSE; + do { + if (!p_ch) + return ABORT_ALL; + if (p_ch == '\\') { + p_ch = *++p; + if (!p_ch) + return ABORT_ALL; + if (t_ch == p_ch) + matched = TRUE; + } else if (p_ch == '-' && prev_ch && p[1] && p[1] != ']') { + p_ch = *++p; + if (p_ch == '\\') { + p_ch = *++p; + if (!p_ch) + return ABORT_ALL; + } + if (t_ch <= p_ch && t_ch >= prev_ch) + matched = TRUE; + p_ch = 0; /* This makes "prev_ch" get set to 0. */ + } else if (p_ch == '[' && p[1] == ':') { + const uchar *s; + int i; + for (s = p += 2; (p_ch = *p) && p_ch != ']'; p++) {} /*SHARED ITERATOR*/ + if (!p_ch) + return ABORT_ALL; + i = p - s - 1; + if (i < 0 || p[-1] != ':') { + /* Didn't find ":]", so treat like a normal set. */ + p = s - 2; + p_ch = '['; + if (t_ch == p_ch) + matched = TRUE; + continue; + } + if (CC_EQ(s,i, "alnum")) { + if (ISALNUM(t_ch)) + matched = TRUE; + } else if (CC_EQ(s,i, "alpha")) { + if (ISALPHA(t_ch)) + matched = TRUE; + } else if (CC_EQ(s,i, "blank")) { + if (ISBLANK(t_ch)) + matched = TRUE; + } else if (CC_EQ(s,i, "cntrl")) { + if (ISCNTRL(t_ch)) + matched = TRUE; + } else if (CC_EQ(s,i, "digit")) { + if (ISDIGIT(t_ch)) + matched = TRUE; + } else if (CC_EQ(s,i, "graph")) { + if (ISGRAPH(t_ch)) + matched = TRUE; + } else if (CC_EQ(s,i, "lower")) { + if (ISLOWER(t_ch)) + matched = TRUE; + } else if (CC_EQ(s,i, "print")) { + if (ISPRINT(t_ch)) + matched = TRUE; + } else if (CC_EQ(s,i, "punct")) { + if (ISPUNCT(t_ch)) + matched = TRUE; + } else if (CC_EQ(s,i, "space")) { + if (ISSPACE(t_ch)) + matched = TRUE; + } else if (CC_EQ(s,i, "upper")) { + if (ISUPPER(t_ch)) + matched = TRUE; + } else if (CC_EQ(s,i, "xdigit")) { + if (ISXDIGIT(t_ch)) + matched = TRUE; + } else /* malformed [:class:] string */ + return ABORT_ALL; + p_ch = 0; /* This makes "prev_ch" get set to 0. */ + } else if (t_ch == p_ch) + matched = TRUE; + } while (prev_ch = p_ch, (p_ch = *++p) != ']'); + if (matched == special || t_ch == '/') + return FALSE; + continue; + } + } + + do { + if (*text) + return FALSE; + } while ((text = *a++) != NULL); + + return TRUE; +} + +/* Match literal string "s" against the a virtually-joined string consisting + * of "text" and any strings in array "a". */ +static int doliteral(const uchar *s, const uchar *text, const uchar*const *a) +{ + for ( ; *s != '\0'; text++, s++) { + while (*text == '\0') { + if ((text = *a++) == NULL) + return FALSE; + } + if (*text != *s) + return FALSE; + } + + do { + if (*text) + return FALSE; + } while ((text = *a++) != NULL); + + return TRUE; +} + +/* Return the last "count" path elements from the concatenated string. + * We return a string pointer to the start of the string, and update the + * array pointer-pointer to point to any remaining string elements. */ +static const uchar *trailing_N_elements(const uchar*const **a_ptr, int count) +{ + const uchar*const *a = *a_ptr; + const uchar*const *first_a = a; + + while (*a) + a++; + + while (a != first_a) { + const uchar *s = *--a; + s += strlen((char*)s); + while (--s >= *a) { + if (*s == '/' && !--count) { + *a_ptr = a+1; + return s+1; + } + } + } + + if (count == 1) { + *a_ptr = a+1; + return *a; + } + + return NULL; +} + +/* Match the "pattern" against the "text" string. */ +int wildmatch(const char *pattern, const char *text) +{ + static const uchar *nomore[1]; /* A NULL pointer. */ +#ifdef WILD_TEST_ITERATIONS + wildmatch_iteration_count = 0; +#endif + return dowild((const uchar*)pattern, (const uchar*)text, nomore) == TRUE; +} + +/* Match the "pattern" against the forced-to-lower-case "text" string. */ +int iwildmatch(const char *pattern, const char *text) +{ + static const uchar *nomore[1]; /* A NULL pointer. */ + int ret; +#ifdef WILD_TEST_ITERATIONS + wildmatch_iteration_count = 0; +#endif + force_lower_case = 1; + ret = dowild((const uchar*)pattern, (const uchar*)text, nomore) == TRUE; + force_lower_case = 0; + return ret; +} + +/* Match pattern "p" against the a virtually-joined string consisting + * of all the pointers in array "texts" (which has a NULL pointer at the + * end). The int "where" can be 0 (normal matching), > 0 (match only + * the trailing N slash-separated filename components of "texts"), or < 0 + * (match the "pattern" at the start or after any slash in "texts"). */ +int wildmatch_array(const char *pattern, const char*const *texts, int where) +{ + const uchar *p = (const uchar*)pattern; + const uchar*const *a = (const uchar*const*)texts; + const uchar *text; + int matched; + +#ifdef WILD_TEST_ITERATIONS + wildmatch_iteration_count = 0; +#endif + + if (where > 0) + text = trailing_N_elements(&a, where); + else + text = *a++; + if (!text) + return FALSE; + + if ((matched = dowild(p, text, a)) != TRUE && where < 0 + && matched != ABORT_ALL) { + while (1) { + if (*text == '\0') { + if ((text = (uchar*)*a++) == NULL) + return FALSE; + continue; + } + if (*text++ == '/' && (matched = dowild(p, text, a)) != FALSE + && matched != ABORT_TO_STARSTAR) + break; + } + } + return matched == TRUE; +} + +/* Match literal string "s" against the a virtually-joined string consisting + * of all the pointers in array "texts" (which has a NULL pointer at the + * end). The int "where" can be 0 (normal matching), or > 0 (match + * only the trailing N slash-separated filename components of "texts"). */ +int litmatch_array(const char *string, const char*const *texts, int where) +{ + const uchar *s = (const uchar*)string; + const uchar*const *a = (const uchar* const*)texts; + const uchar *text; + + if (where > 0) + text = trailing_N_elements(&a, where); + else + text = *a++; + if (!text) + return FALSE; + + return doliteral(s, text, a) == TRUE; +} |