Messages in this thread Patch in this message |  | | From | Ammar Faizi <> | Subject | [RFC PATCH v1 6/6] tools/include/string: Implement `strdup()` and `strndup()` | Date | Sun, 20 Mar 2022 16:37:50 +0700 |
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Add strdup and strndup support. These functions are only available on architectures that have my_syscall6() macro from nolibc.
Signed-off-by: Ammar Faizi <ammarfaizi2@gnuweeb.org> --- tools/include/nolibc/string.h | 68 +++++++++++++++++++++++++++++++++++ 1 file changed, 68 insertions(+)
diff --git a/tools/include/nolibc/string.h b/tools/include/nolibc/string.h index 4554b6fcb400..413c65f7c853 100644 --- a/tools/include/nolibc/string.h +++ b/tools/include/nolibc/string.h @@ -9,6 +9,10 @@ #include "std.h" +static void free(void *ptr); +static void *malloc(size_t len); +static void *realloc(void *old_ptr, size_t new_size); + /* * As much as possible, please keep functions alphabetically sorted. */ @@ -127,6 +131,70 @@ size_t nolibc_strlen(const char *str) nolibc_strlen((str)); \ }) +static __attribute__((unused)) +char *strdup(const char *str) +{ + size_t allocated = 2048; + size_t i; + char *ret; + char *tmp; + + ret = malloc(allocated); + if (__builtin_expect(!ret, 0)) + return NULL; + + i = 0; + for (;;) { + char c = *str; + if (!c) + break; + + if (i == allocated) { + allocated += 2048; + tmp = realloc(ret, allocated); + if (__builtin_expect(!tmp, 0)) { + free(ret); + return NULL; + } + ret = tmp; + } + + ret[i++] = c; + str++; + } + + ret[i] = '\0'; + return ret; +} + +static __attribute__((unused)) +char *strndup(const char *str, size_t maxlen) +{ + size_t i; + char *ret; + + ret = malloc(maxlen + 1); + if (__builtin_expect(!ret, 0)) + return NULL; + + i = 0; + for (;;) { + char c = *str; + if (!c) + break; + + if (i == maxlen) + break; + + ret[i++] = c; + str++; + } + + ret[i] = '\0'; + return ret; +} + + static __attribute__((unused)) size_t strlcat(char *dst, const char *src, size_t size) { -- Ammar Faizi
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