diff options
Diffstat (limited to 'lib/pattern.c')
| -rw-r--r-- | lib/pattern.c | 472 |
1 files changed, 0 insertions, 472 deletions
diff --git a/lib/pattern.c b/lib/pattern.c deleted file mode 100644 index 0aeb9352..00000000 --- a/lib/pattern.c +++ /dev/null @@ -1,472 +0,0 @@ -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <limits.h> -#include <errno.h> -#include <assert.h> - -#include "strntol.h" -#include "pattern.h" -#include "../minmax.h" -#include "../oslib/strcasestr.h" - -/** - * parse_string() - parses string in double quotes, like "abc" - * @beg - string input - * @out - output buffer where parsed number should be put - * @out_len - length of the output buffer - * @filled - pointer where number of bytes successfully - * parsed will be put - * - * Returns the end pointer where parsing has been stopped. - * In case of parsing error or lack of bytes in output buffer - * NULL will be returned. - */ -static const char *parse_string(const char *beg, char *out, - unsigned int out_len, - unsigned int *filled) -{ - const char *end; - - if (!out_len) - return NULL; - - assert(*beg == '"'); - beg++; - end = strchr(beg, '"'); - if (!end) - return NULL; - if (end - beg > out_len) - return NULL; - - memcpy(out, beg, end - beg); - *filled = end - beg; - - /* Catch up quote */ - return end + 1; -} - -/** - * parse_number() - parses numbers - * @beg - string input - * @out - output buffer where parsed number should be put - * @out_len - length of the output buffer - * @filled - pointer where number of bytes successfully - * parsed will be put - * - * Supports decimals in the range [INT_MIN, INT_MAX] and - * hexidecimals of any size, which should be started with - * prefix 0x or 0X. - * - * Returns the end pointer where parsing has been stopped. - * In case of parsing error or lack of bytes in output buffer - * NULL will be returned. - */ -static const char *parse_number(const char *beg, char *out, - unsigned int out_len, - unsigned int *filled) -{ - const char *end; - unsigned int val; - long lval; - int num, i; - - if (!out_len) - return NULL; - - num = 0; - sscanf(beg, "0%*[xX]%*[0-9a-fA-F]%n", &num); - if (num == 0) { - /* Here we are trying to parse decimal */ - - char *_end; - - /* Looking ahead */ - _end = strcasestr(beg, "0x"); - if (_end) - num = _end - beg; - if (num) - lval = strntol(beg, num, &_end, 10); - else - lval = strtol(beg, &_end, 10); - if (beg == _end || lval > INT_MAX || lval < INT_MIN) - return NULL; - end = _end; - i = 0; - if (!lval) { - num = 0; - out[i] = 0x00; - i = 1; - } else { - val = (unsigned int)lval; - for (; val && out_len; out_len--, i++, val >>= 8) - out[i] = val & 0xff; - if (val) - return NULL; - } - } else { - assert(num > 2); - - /* Catch up 0x prefix */ - num -= 2; - beg += 2; - - /* Look back, handle this combined string: 0xff0x14 */ - if (beg[num] && !strncasecmp(&beg[num - 1], "0x", 2)) - num--; - - end = beg + num; - - for (i = 0; num && out_len; - out_len--, i++, num -= 2, beg += 2) { - const char *fmt; - - fmt = (num & 1 ? "%1hhx" : "%2hhx"); - sscanf(beg, fmt, &out[i]); - if (num & 1) { - num++; - beg--; - } - } - if (num) - return NULL; - } - - *filled = i; - return end; - -} - -/** - * parse_format() - parses formats, like %o, etc - * @in - string input - * @out - output buffer where space for format should be reserved - * @parsed - number of bytes which were already parsed so far - * @out_len - length of the output buffer - * @fmt_desc - format descritor array, what we expect to find - * @fmt_desc_sz - size of the format descritor array - * @fmt - format array, the output - * @fmt_sz - size of format array - * - * This function tries to find formats, e.g.: - * %o - offset of the block - * - * In case of successfull parsing it fills the format param - * with proper offset and the size of the expected value, which - * should be pasted into buffer using the format 'func' callback. - * - * Returns the end pointer where parsing has been stopped. - * In case of parsing error or lack of bytes in output buffer - * NULL will be returned. - */ -static const char *parse_format(const char *in, char *out, unsigned int parsed, - unsigned int out_len, unsigned int *filled, - const struct pattern_fmt_desc *fmt_desc, - unsigned int fmt_desc_sz, - struct pattern_fmt *fmt, unsigned int fmt_sz) -{ - int i; - struct pattern_fmt *f = NULL; - unsigned int len = 0; - - if (!out_len || !fmt_desc || !fmt_desc_sz || !fmt || !fmt_sz) - return NULL; - - assert(*in == '%'); - - for (i = 0; i < fmt_desc_sz; i++) { - const struct pattern_fmt_desc *desc; - - desc = &fmt_desc[i]; - len = strlen(desc->fmt); - if (0 == strncmp(in, desc->fmt, len)) { - fmt->desc = desc; - fmt->off = parsed; - f = fmt; - break; - } - } - - if (!f) - return NULL; - if (f->desc->len > out_len) - return NULL; - - memset(out, '\0', f->desc->len); - *filled = f->desc->len; - - return in + len; -} - -/** - * parse_and_fill_pattern() - Parses combined input, which consists of strings, - * numbers and pattern formats. - * @in - string input - * @in_len - size of the input string - * @out - output buffer where parsed result will be put - * @out_len - lengths of the output buffer - * @fmt_desc - array of pattern format descriptors [input] - * @fmt_desc_sz - size of the format descriptor array - * @fmt - array of pattern formats [output] - * @fmt_sz - pointer where the size of pattern formats array stored [input], - * after successfull parsing this pointer will contain the number - * of parsed formats if any [output]. - * - * strings: - * bytes sequence in double quotes, e.g. "123". - * NOTE: there is no way to escape quote, so "123\"abc" does not work. - * - * numbers: - * hexidecimal - sequence of hex bytes starting from 0x or 0X prefix, - * e.g. 0xff12ceff1100ff - * decimal - decimal number in range [INT_MIN, INT_MAX] - * - * formats: - * %o - offset of block, reserved 8 bytes. - * - * Explicit examples of combined string: - * #1 #2 #3 #4 - * in="abcd" in=-1024 in=66 in=0xFF0X1 - * out=61 62 63 64 out=00 fc ff ff out=42 out=ff 01 - * - * #5 #6 - * in=%o in="123"0xFFeeCC - * out=00 00 00 00 00 00 00 00 out=31 32 33 ff ec cc - * - * #7 - * in=-100xab"1"%o"2" - * out=f6 ff ff ff ab 31 00 00 00 00 00 00 00 00 32 - * - * #9 - * in=%o0xdeadbeef%o - * out=00 00 00 00 00 00 00 00 de ad be ef 00 00 00 00 00 00 00 00 - * - * #10 - * in=0xfefefefefefefefefefefefefefefefefefefefefe - * out=fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe - * - * Returns number of bytes filled or err < 0 in case of failure. - */ -int parse_and_fill_pattern(const char *in, unsigned int in_len, - char *out, unsigned int out_len, - const struct pattern_fmt_desc *fmt_desc, - unsigned int fmt_desc_sz, - struct pattern_fmt *fmt, - unsigned int *fmt_sz_out) -{ - const char *beg, *end, *out_beg = out; - unsigned int total = 0, fmt_rem = 0; - - if (!in || !in_len || !out || !out_len) - return -EINVAL; - if (fmt_sz_out) - fmt_rem = *fmt_sz_out; - - beg = in; - do { - unsigned int filled; - int parsed_fmt; - - filled = 0; - parsed_fmt = 0; - - switch (*beg) { - case '"': - end = parse_string(beg, out, out_len, &filled); - break; - case '%': - end = parse_format(beg, out, out - out_beg, out_len, - &filled, fmt_desc, fmt_desc_sz, - fmt, fmt_rem); - parsed_fmt = 1; - break; - default: - end = parse_number(beg, out, out_len, &filled); - break; - } - - if (!end) - return -EINVAL; - - if (parsed_fmt) { - assert(fmt_rem); - fmt_rem--; - fmt++; - } - - assert(end - beg <= in_len); - in_len -= end - beg; - beg = end; - - assert(filled); - assert(filled <= out_len); - out_len -= filled; - out += filled; - total += filled; - - } while (in_len); - - if (fmt_sz_out) - *fmt_sz_out -= fmt_rem; - return total; -} - -/** - * dup_pattern() - Duplicates part of the pattern all over the buffer. - * - * Returns 0 in case of success or errno < 0 in case of failure. - */ -static int dup_pattern(char *out, unsigned int out_len, unsigned int pattern_len) -{ - unsigned int left, len, off; - - if (out_len <= pattern_len) - /* Normal case */ - return 0; - - off = pattern_len; - left = (out_len - off); - len = min(left, off); - - /* Duplicate leftover */ - while (left) { - memcpy(out + off, out, len); - left -= len; - off <<= 1; - len = min(left, off); - } - - return 0; -} - -/** - * cpy_pattern() - Copies pattern to the buffer. - * - * Function copies pattern along the whole buffer. - * - * Returns 0 in case of success or errno < 0 in case of failure. - */ -int cpy_pattern(const char *pattern, unsigned int pattern_len, - char *out, unsigned int out_len) -{ - unsigned int len; - - if (!pattern || !pattern_len || !out || !out_len) - return -EINVAL; - - /* Copy pattern */ - len = min(pattern_len, out_len); - memcpy(out, pattern, len); - - /* Spread filled chunk all over the buffer */ - return dup_pattern(out, out_len, pattern_len); -} - -/** - * cmp_pattern() - Compares pattern and buffer. - * - * For the sake of performance this function avoids any loops. - * Firstly it tries to compare the buffer itself, checking that - * buffer consists of repeating patterns along the buffer size. - * - * If the difference is not found then the function tries to compare - * buffer and pattern. - * - * Returns 0 in case of success or errno < 0 in case of failure. - */ -int cmp_pattern(const char *pattern, unsigned int pattern_size, - unsigned int off, const char *buf, unsigned int len) -{ - int rc; - unsigned int size; - - /* Find the difference in buffer */ - if (len > pattern_size) { - rc = memcmp(buf, buf + pattern_size, len - pattern_size); - if (rc) - return -EILSEQ; - } - /* Compare second part of the pattern with buffer */ - if (off) { - size = min(len, pattern_size - off); - rc = memcmp(buf, pattern + off, size); - if (rc) - return -EILSEQ; - buf += size; - len -= size; - } - /* Compare first part of the pattern or the whole pattern - * with buffer */ - if (len) { - size = min(len, (off ? off : pattern_size)); - rc = memcmp(buf, pattern, size); - if (rc) - return -EILSEQ; - } - - return 0; -} - -/** - * paste_format_inplace() - Pastes parsed formats to the pattern. - * - * This function pastes formats to the pattern. If @fmt_sz is 0 - * function does nothing and pattern buffer is left untouched. - * - * Returns 0 in case of success or errno < 0 in case of failure. - */ -int paste_format_inplace(char *pattern, unsigned int pattern_len, - struct pattern_fmt *fmt, unsigned int fmt_sz, - void *priv) -{ - int i, rc; - unsigned int len; - - if (!pattern || !pattern_len || !fmt) - return -EINVAL; - - /* Paste formats for first pattern chunk */ - for (i = 0; i < fmt_sz; i++) { - struct pattern_fmt *f; - - f = &fmt[i]; - if (pattern_len <= f->off) - break; - len = min(pattern_len - f->off, f->desc->len); - rc = f->desc->paste(pattern + f->off, len, priv); - if (rc) - return rc; - } - - return 0; -} - -/** - * paste_format() - Pastes parsed formats to the buffer. - * - * This function copies pattern to the buffer, pastes format - * into it and then duplicates pattern all over the buffer size. - * - * Returns 0 in case of success or errno < 0 in case of failure. - */ -int paste_format(const char *pattern, unsigned int pattern_len, - struct pattern_fmt *fmt, unsigned int fmt_sz, - char *out, unsigned int out_len, void *priv) -{ - int rc; - unsigned int len; - - if (!pattern || !pattern_len || !out || !out_len) - return -EINVAL; - - /* Copy pattern */ - len = min(pattern_len, out_len); - memcpy(out, pattern, len); - - rc = paste_format_inplace(out, len, fmt, fmt_sz, priv); - if (rc) - return rc; - - /* Spread filled chunk all over the buffer */ - return dup_pattern(out, out_len, pattern_len); -} |