| /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
| |
| #if !SD_BOOT |
| # include <ctype.h> |
| #endif |
| |
| #include "macro-fundamental.h" |
| #include "string-util-fundamental.h" |
| |
| sd_char *startswith(const sd_char *s, const sd_char *prefix) { |
| size_t l; |
| |
| assert(s); |
| assert(prefix); |
| |
| l = strlen(prefix); |
| if (!strneq(s, prefix, l)) |
| return NULL; |
| |
| return (sd_char*) s + l; |
| } |
| |
| #if !SD_BOOT |
| sd_char *startswith_no_case(const sd_char *s, const sd_char *prefix) { |
| size_t l; |
| |
| assert(s); |
| assert(prefix); |
| |
| l = strlen(prefix); |
| if (!strncaseeq(s, prefix, l)) |
| return NULL; |
| |
| return (sd_char*) s + l; |
| } |
| #endif |
| |
| sd_char* endswith(const sd_char *s, const sd_char *postfix) { |
| size_t sl, pl; |
| |
| assert(s); |
| assert(postfix); |
| |
| sl = strlen(s); |
| pl = strlen(postfix); |
| |
| if (pl == 0) |
| return (sd_char*) s + sl; |
| |
| if (sl < pl) |
| return NULL; |
| |
| if (strcmp(s + sl - pl, postfix) != 0) |
| return NULL; |
| |
| return (sd_char*) s + sl - pl; |
| } |
| |
| sd_char* endswith_no_case(const sd_char *s, const sd_char *postfix) { |
| size_t sl, pl; |
| |
| assert(s); |
| assert(postfix); |
| |
| sl = strlen(s); |
| pl = strlen(postfix); |
| |
| if (pl == 0) |
| return (sd_char*) s + sl; |
| |
| if (sl < pl) |
| return NULL; |
| |
| if (strcasecmp(s + sl - pl, postfix) != 0) |
| return NULL; |
| |
| return (sd_char*) s + sl - pl; |
| } |
| |
| static bool is_valid_version_char(sd_char a) { |
| return ascii_isdigit(a) || ascii_isalpha(a) || IN_SET(a, '~', '-', '^', '.'); |
| } |
| |
| int strverscmp_improved(const sd_char *a, const sd_char *b) { |
| /* This function is similar to strverscmp(3), but it treats '-' and '.' as separators. |
| * |
| * The logic is based on rpm's rpmvercmp(), but unlike rpmvercmp(), it distiguishes e.g. |
| * '123a' and '123.a', with '123a' being newer. |
| * |
| * It allows direct comparison of strings which contain both a version and a release; e.g. |
| * '247.2-3.1.fc33.x86_64' or '5.11.0-0.rc5.20210128git76c057c84d28.137.fc34'. |
| * |
| * The input string is split into segments. Each segment is numeric or alphabetic, and may be |
| * prefixed with the following: |
| * '~' : used for pre-releases, a segment prefixed with this is the oldest, |
| * '-' : used for the separator between version and release, |
| * '^' : used for patched releases, a segment with this is newer than one with '-'. |
| * '.' : used for point releases. |
| * Note that no prefix segment is the newest. All non-supported characters are dropped, and |
| * handled as a separator of segments, e.g., '123_a' is equivalent to '123a'. |
| * |
| * By using this, version strings can be sorted like following: |
| * (older) 122.1 |
| * ^ 123~rc1-1 |
| * | 123 |
| * | 123-a |
| * | 123-a.1 |
| * | 123-1 |
| * | 123-1.1 |
| * | 123^post1 |
| * | 123.a-1 |
| * | 123.1-1 |
| * v 123a-1 |
| * (newer) 124-1 |
| */ |
| |
| a = strempty(a); |
| b = strempty(b); |
| |
| for (;;) { |
| const sd_char *aa, *bb; |
| int r; |
| |
| /* Drop leading invalid characters. */ |
| while (*a != '\0' && !is_valid_version_char(*a)) |
| a++; |
| while (*b != '\0' && !is_valid_version_char(*b)) |
| b++; |
| |
| /* Handle '~'. Used for pre-releases, e.g. 123~rc1, or 4.5~alpha1 */ |
| if (*a == '~' || *b == '~') { |
| /* The string prefixed with '~' is older. */ |
| r = CMP(*a != '~', *b != '~'); |
| if (r != 0) |
| return r; |
| |
| /* Now both strings are prefixed with '~'. Compare remaining strings. */ |
| a++; |
| b++; |
| } |
| |
| /* If at least one string reaches the end, then longer is newer. |
| * Note that except for '~' prefixed segments, a string which has more segments is newer. |
| * So, this check must be after the '~' check. */ |
| if (*a == '\0' || *b == '\0') |
| return CMP(*a, *b); |
| |
| /* Handle '-', which separates version and release, e.g 123.4-3.1.fc33.x86_64 */ |
| if (*a == '-' || *b == '-') { |
| /* The string prefixed with '-' is older (e.g., 123-9 vs 123.1-1) */ |
| r = CMP(*a != '-', *b != '-'); |
| if (r != 0) |
| return r; |
| |
| a++; |
| b++; |
| } |
| |
| /* Handle '^'. Used for patched release. */ |
| if (*a == '^' || *b == '^') { |
| r = CMP(*a != '^', *b != '^'); |
| if (r != 0) |
| return r; |
| |
| a++; |
| b++; |
| } |
| |
| /* Handle '.'. Used for point releases. */ |
| if (*a == '.' || *b == '.') { |
| r = CMP(*a != '.', *b != '.'); |
| if (r != 0) |
| return r; |
| |
| a++; |
| b++; |
| } |
| |
| if (ascii_isdigit(*a) || ascii_isdigit(*b)) { |
| /* Find the leading numeric segments. One may be an empty string. So, |
| * numeric segments are always newer than alpha segments. */ |
| for (aa = a; ascii_isdigit(*aa); aa++) |
| ; |
| for (bb = b; ascii_isdigit(*bb); bb++) |
| ; |
| |
| /* Check if one of the strings was empty, but the other not. */ |
| r = CMP(a != aa, b != bb); |
| if (r != 0) |
| return r; |
| |
| /* Skip leading '0', to make 00123 equivalent to 123. */ |
| while (*a == '0') |
| a++; |
| while (*b == '0') |
| b++; |
| |
| /* To compare numeric segments without parsing their values, first compare the |
| * lengths of the segments. Eg. 12345 vs 123, longer is newer. */ |
| r = CMP(aa - a, bb - b); |
| if (r != 0) |
| return r; |
| |
| /* Then, compare them as strings. */ |
| r = CMP(strncmp(a, b, aa - a), 0); |
| if (r != 0) |
| return r; |
| } else { |
| /* Find the leading non-numeric segments. */ |
| for (aa = a; ascii_isalpha(*aa); aa++) |
| ; |
| for (bb = b; ascii_isalpha(*bb); bb++) |
| ; |
| |
| /* Note that the segments are usually not NUL-terminated. */ |
| r = CMP(strncmp(a, b, MIN(aa - a, bb - b)), 0); |
| if (r != 0) |
| return r; |
| |
| /* Longer is newer, e.g. abc vs abcde. */ |
| r = CMP(aa - a, bb - b); |
| if (r != 0) |
| return r; |
| } |
| |
| /* The current segments are equivalent. Let's move to the next one. */ |
| a = aa; |
| b = bb; |
| } |
| } |
