87f5446311
The only real difference is that this wrapper can deal with NULL pointer arguments, but only if the length is also zero. CID 1396277
266 lines
8 KiB
C
266 lines
8 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#pragma once
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#include <alloca.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include <string.h>
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#include "macro.h"
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/* What is interpreted as whitespace? */
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#define WHITESPACE " \t\n\r"
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#define NEWLINE "\n\r"
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#define QUOTES "\"\'"
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#define COMMENTS "#;"
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#define GLOB_CHARS "*?["
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#define DIGITS "0123456789"
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#define LOWERCASE_LETTERS "abcdefghijklmnopqrstuvwxyz"
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#define UPPERCASE_LETTERS "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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#define LETTERS LOWERCASE_LETTERS UPPERCASE_LETTERS
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#define ALPHANUMERICAL LETTERS DIGITS
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#define HEXDIGITS DIGITS "abcdefABCDEF"
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#define streq(a,b) (strcmp((a),(b)) == 0)
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#define strneq(a, b, n) (strncmp((a), (b), (n)) == 0)
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#define strcaseeq(a,b) (strcasecmp((a),(b)) == 0)
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#define strncaseeq(a, b, n) (strncasecmp((a), (b), (n)) == 0)
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int strcmp_ptr(const char *a, const char *b) _pure_;
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static inline bool streq_ptr(const char *a, const char *b) {
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return strcmp_ptr(a, b) == 0;
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}
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static inline const char* strempty(const char *s) {
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return s ?: "";
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}
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static inline const char* strnull(const char *s) {
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return s ?: "(null)";
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}
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static inline const char *strna(const char *s) {
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return s ?: "n/a";
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}
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static inline bool isempty(const char *p) {
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return !p || !p[0];
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}
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static inline const char *empty_to_null(const char *p) {
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return isempty(p) ? NULL : p;
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}
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static inline const char *empty_to_dash(const char *str) {
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return isempty(str) ? "-" : str;
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}
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static inline char *startswith(const char *s, const char *prefix) {
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size_t l;
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l = strlen(prefix);
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if (strncmp(s, prefix, l) == 0)
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return (char*) s + l;
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return NULL;
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}
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static inline char *startswith_no_case(const char *s, const char *prefix) {
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size_t l;
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l = strlen(prefix);
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if (strncasecmp(s, prefix, l) == 0)
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return (char*) s + l;
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return NULL;
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}
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char *endswith(const char *s, const char *postfix) _pure_;
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char *endswith_no_case(const char *s, const char *postfix) _pure_;
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char *first_word(const char *s, const char *word) _pure_;
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typedef enum SplitFlags {
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SPLIT_QUOTES = 0x01 << 0,
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SPLIT_RELAX = 0x01 << 1,
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} SplitFlags;
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const char* split(const char **state, size_t *l, const char *separator, SplitFlags flags);
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#define FOREACH_WORD(word, length, s, state) \
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_FOREACH_WORD(word, length, s, WHITESPACE, 0, state)
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#define FOREACH_WORD_SEPARATOR(word, length, s, separator, state) \
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_FOREACH_WORD(word, length, s, separator, 0, state)
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#define _FOREACH_WORD(word, length, s, separator, flags, state) \
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for ((state) = (s), (word) = split(&(state), &(length), (separator), (flags)); (word); (word) = split(&(state), &(length), (separator), (flags)))
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char *strappend(const char *s, const char *suffix);
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char *strnappend(const char *s, const char *suffix, size_t length);
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char *strjoin_real(const char *x, ...) _sentinel_;
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#define strjoin(a, ...) strjoin_real((a), __VA_ARGS__, NULL)
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#define strjoina(a, ...) \
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({ \
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const char *_appendees_[] = { a, __VA_ARGS__ }; \
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char *_d_, *_p_; \
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size_t _len_ = 0; \
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size_t _i_; \
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for (_i_ = 0; _i_ < ELEMENTSOF(_appendees_) && _appendees_[_i_]; _i_++) \
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_len_ += strlen(_appendees_[_i_]); \
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_p_ = _d_ = alloca(_len_ + 1); \
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for (_i_ = 0; _i_ < ELEMENTSOF(_appendees_) && _appendees_[_i_]; _i_++) \
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_p_ = stpcpy(_p_, _appendees_[_i_]); \
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*_p_ = 0; \
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_d_; \
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})
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char *strstrip(char *s);
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char *delete_chars(char *s, const char *bad);
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char *delete_trailing_chars(char *s, const char *bad);
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char *truncate_nl(char *s);
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static inline char *skip_leading_chars(const char *s, const char *bad) {
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if (!s)
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return NULL;
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if (!bad)
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bad = WHITESPACE;
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return (char*) s + strspn(s, bad);
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}
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char ascii_tolower(char x);
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char *ascii_strlower(char *s);
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char *ascii_strlower_n(char *s, size_t n);
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char ascii_toupper(char x);
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char *ascii_strupper(char *s);
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int ascii_strcasecmp_n(const char *a, const char *b, size_t n);
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int ascii_strcasecmp_nn(const char *a, size_t n, const char *b, size_t m);
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bool chars_intersect(const char *a, const char *b) _pure_;
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static inline bool _pure_ in_charset(const char *s, const char* charset) {
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assert(s);
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assert(charset);
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return s[strspn(s, charset)] == '\0';
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}
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bool string_has_cc(const char *p, const char *ok) _pure_;
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char *ellipsize_mem(const char *s, size_t old_length_bytes, size_t new_length_columns, unsigned percent);
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static inline char *ellipsize(const char *s, size_t length, unsigned percent) {
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return ellipsize_mem(s, strlen(s), length, percent);
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}
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char *cellescape(char *buf, size_t len, const char *s);
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/* This limit is arbitrary, enough to give some idea what the string contains */
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#define CELLESCAPE_DEFAULT_LENGTH 64
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bool nulstr_contains(const char *nulstr, const char *needle);
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char* strshorten(char *s, size_t l);
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char *strreplace(const char *text, const char *old_string, const char *new_string);
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char *strip_tab_ansi(char **ibuf, size_t *_isz, size_t highlight[2]);
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char *strextend_with_separator(char **x, const char *separator, ...) _sentinel_;
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#define strextend(x, ...) strextend_with_separator(x, NULL, __VA_ARGS__)
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char *strrep(const char *s, unsigned n);
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int split_pair(const char *s, const char *sep, char **l, char **r);
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int free_and_strdup(char **p, const char *s);
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int free_and_strndup(char **p, const char *s, size_t l);
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/* Normal memmem() requires haystack to be nonnull, which is annoying for zero-length buffers */
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static inline void *memmem_safe(const void *haystack, size_t haystacklen, const void *needle, size_t needlelen) {
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if (needlelen <= 0)
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return (void*) haystack;
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if (haystacklen < needlelen)
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return NULL;
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assert(haystack);
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assert(needle);
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return memmem(haystack, haystacklen, needle, needlelen);
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}
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#if HAVE_EXPLICIT_BZERO
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static inline void* explicit_bzero_safe(void *p, size_t l) {
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if (l > 0)
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explicit_bzero(p, l);
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return p;
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}
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#else
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void explicit_bzero_safe(void *p, size_t l);
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#endif
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char *string_erase(char *x);
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char *string_free_erase(char *s);
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DEFINE_TRIVIAL_CLEANUP_FUNC(char *, string_free_erase);
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#define _cleanup_string_free_erase_ _cleanup_(string_free_erasep)
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bool string_is_safe(const char *p) _pure_;
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static inline size_t strlen_ptr(const char *s) {
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if (!s)
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return 0;
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return strlen(s);
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}
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/* Like startswith(), but operates on arbitrary memory blocks */
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static inline void *memory_startswith(const void *p, size_t sz, const char *token) {
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size_t n;
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assert(token);
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n = strlen(token);
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if (sz < n)
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return NULL;
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assert(p);
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if (memcmp(p, token, n) != 0)
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return NULL;
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return (uint8_t*) p + n;
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}
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/* Like startswith_no_case(), but operates on arbitrary memory blocks.
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* It works only for ASCII strings.
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*/
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static inline void *memory_startswith_no_case(const void *p, size_t sz, const char *token) {
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size_t n, i;
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assert(token);
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n = strlen(token);
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if (sz < n)
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return NULL;
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assert(p);
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for (i = 0; i < n; i++) {
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if (ascii_tolower(((char *)p)[i]) != ascii_tolower(token[i]))
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return NULL;
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}
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return (uint8_t*) p + n;
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}
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