src/basic/string-util.h

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 #pragma once
   3
   4 #include <stdbool.h>
   5 #include <stddef.h>
   6 #include <string.h>
   7
   8 #include "alloc-util.h"
   9 #include "macro.h"
  10
  11 /* What is interpreted as whitespace? */
  12 #define WHITESPACE        " \t\n\r"
  13 #define NEWLINE           "\n\r"
  14 #define QUOTES            "\"\'"
  15 #define COMMENTS          "#;"
  16 #define GLOB_CHARS        "*?["
  17 #define DIGITS            "0123456789"
  18 #define LOWERCASE_LETTERS "abcdefghijklmnopqrstuvwxyz"
  19 #define UPPERCASE_LETTERS "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
  20 #define LETTERS           LOWERCASE_LETTERS UPPERCASE_LETTERS
  21 #define ALPHANUMERICAL    LETTERS DIGITS
  22 #define HEXDIGITS         DIGITS "abcdefABCDEF"
  23
  24 #define streq(a,b) (strcmp((a),(b)) == 0)
  25 #define strneq(a, b, n) (strncmp((a), (b), (n)) == 0)
  26 #define strcaseeq(a,b) (strcasecmp((a),(b)) == 0)
  27 #define strncaseeq(a, b, n) (strncasecmp((a), (b), (n)) == 0)
  28
  29 int strcmp_ptr(const char *a, const char *b) _pure_;
  30 int strcasecmp_ptr(const char *a, const char *b) _pure_;
  31
  32 static inline bool streq_ptr(const char *a, const char *b) {
  33         return strcmp_ptr(a, b) == 0;
  34 }
  35
  36 static inline const char* strempty(const char *s) {
  37         return s ?: "";
  38 }
  39
  40 static inline const char* strnull(const char *s) {
  41         return s ?: "(null)";
  42 }
  43
  44 static inline const char *strna(const char *s) {
  45         return s ?: "n/a";
  46 }
  47
  48 static inline const char* yes_no(bool b) {
  49         return b ? "yes" : "no";
  50 }
  51
  52 static inline const char* true_false(bool b) {
  53         return b ? "true" : "false";
  54 }
  55
  56 static inline const char* one_zero(bool b) {
  57         return b ? "1" : "0";
  58 }
  59
  60 static inline const char* enable_disable(bool b) {
  61         return b ? "enable" : "disable";
  62 }
  63
  64 static inline bool isempty(const char *p) {
  65         return !p || !p[0];
  66 }
  67
  68 static inline const char *empty_to_null(const char *p) {
  69         return isempty(p) ? NULL : p;
  70 }
  71
  72 static inline const char *empty_to_dash(const char *str) {
  73         return isempty(str) ? "-" : str;
  74 }
  75
  76 static inline bool empty_or_dash(const char *str) {
  77         return !str ||
  78                 str[0] == 0 ||
  79                 (str[0] == '-' && str[1] == 0);
  80 }
  81
  82 static inline const char *empty_or_dash_to_null(const char *p) {
  83         return empty_or_dash(p) ? NULL : p;
  84 }
  85
  86 static inline char *startswith(const char *s, const char *prefix) {
  87         size_t l;
  88
  89         l = strlen(prefix);
  90         if (strncmp(s, prefix, l) == 0)
  91                 return (char*) s + l;
  92
  93         return NULL;
  94 }
  95
  96 static inline char *startswith_no_case(const char *s, const char *prefix) {
  97         size_t l;
  98
  99         l = strlen(prefix);
 100         if (strncasecmp(s, prefix, l) == 0)
 101                 return (char*) s + l;
 102
 103         return NULL;
 104 }
 105
 106 char *endswith(const char *s, const char *postfix) _pure_;
 107 char *endswith_no_case(const char *s, const char *postfix) _pure_;
 108
 109 char *first_word(const char *s, const char *word) _pure_;
 110
 111 char *strnappend(const char *s, const char *suffix, size_t length);
 112
 113 char *strjoin_real(const char *x, ...) _sentinel_;
 114 #define strjoin(a, ...) strjoin_real((a), __VA_ARGS__, NULL)
 115
 116 #define strjoina(a, ...)                                                \
 117         ({                                                              \
 118                 const char *_appendees_[] = { a, __VA_ARGS__ };         \
 119                 char *_d_, *_p_;                                        \
 120                 size_t _len_ = 0;                                       \
 121                 size_t _i_;                                             \
 122                 for (_i_ = 0; _i_ < ELEMENTSOF(_appendees_) && _appendees_[_i_]; _i_++) \
 123                         _len_ += strlen(_appendees_[_i_]);              \
 124                 _p_ = _d_ = newa(char, _len_ + 1);                      \
 125                 for (_i_ = 0; _i_ < ELEMENTSOF(_appendees_) && _appendees_[_i_]; _i_++) \
 126                         _p_ = stpcpy(_p_, _appendees_[_i_]);            \
 127                 *_p_ = 0;                                               \
 128                 _d_;                                                    \
 129         })
 130
 131 char *strstrip(char *s);
 132 char *delete_chars(char *s, const char *bad);
 133 char *delete_trailing_chars(char *s, const char *bad);
 134 char *truncate_nl(char *s);
 135
 136 static inline char *skip_leading_chars(const char *s, const char *bad) {
 137         if (!s)
 138                 return NULL;
 139
 140         if (!bad)
 141                 bad = WHITESPACE;
 142
 143         return (char*) s + strspn(s, bad);
 144 }
 145
 146 char ascii_tolower(char x);
 147 char *ascii_strlower(char *s);
 148 char *ascii_strlower_n(char *s, size_t n);
 149
 150 char ascii_toupper(char x);
 151 char *ascii_strupper(char *s);
 152
 153 int ascii_strcasecmp_n(const char *a, const char *b, size_t n);
 154 int ascii_strcasecmp_nn(const char *a, size_t n, const char *b, size_t m);
 155
 156 bool chars_intersect(const char *a, const char *b) _pure_;
 157
 158 static inline bool _pure_ in_charset(const char *s, const char* charset) {
 159         assert(s);
 160         assert(charset);
 161         return s[strspn(s, charset)] == '\0';
 162 }
 163
 164 bool string_has_cc(const char *p, const char *ok) _pure_;
 165
 166 char *ellipsize_mem(const char *s, size_t old_length_bytes, size_t new_length_columns, unsigned percent);
 167 static inline char *ellipsize(const char *s, size_t length, unsigned percent) {
 168         return ellipsize_mem(s, strlen(s), length, percent);
 169 }
 170
 171 char *cellescape(char *buf, size_t len, const char *s);
 172
 173 /* This limit is arbitrary, enough to give some idea what the string contains */
 174 #define CELLESCAPE_DEFAULT_LENGTH 64
 175
 176 char* strshorten(char *s, size_t l);
 177
 178 char *strreplace(const char *text, const char *old_string, const char *new_string);
 179
 180 char *strip_tab_ansi(char **ibuf, size_t *_isz, size_t highlight[2]);
 181
 182 char *strextend_with_separator(char **x, const char *separator, ...) _sentinel_;
 183
 184 #define strextend(x, ...) strextend_with_separator(x, NULL, __VA_ARGS__)
 185
 186 char *strrep(const char *s, unsigned n);
 187
 188 int split_pair(const char *s, const char *sep, char **l, char **r);
 189
 190 int free_and_strdup(char **p, const char *s);
 191 static inline int free_and_strdup_warn(char **p, const char *s) {
 192         if (free_and_strdup(p, s) < 0)
 193                 return log_oom();
 194         return 0;
 195 }
 196 int free_and_strndup(char **p, const char *s, size_t l);
 197
 198 bool string_is_safe(const char *p) _pure_;
 199
 200 static inline size_t strlen_ptr(const char *s) {
 201         if (!s)
 202                 return 0;
 203
 204         return strlen(s);
 205 }
 206
 207 DISABLE_WARNING_STRINGOP_TRUNCATION;
 208 static inline void strncpy_exact(char *buf, const char *src, size_t buf_len) {
 209         strncpy(buf, src, buf_len);
 210 }
 211 REENABLE_WARNING;
 212
 213 /* Like startswith(), but operates on arbitrary memory blocks */
 214 static inline void *memory_startswith(const void *p, size_t sz, const char *token) {
 215         assert(token);
 216
 217         size_t n = strlen(token);
 218         if (sz < n)
 219                 return NULL;
 220
 221         assert(p);
 222
 223         if (memcmp(p, token, n) != 0)
 224                 return NULL;
 225
 226         return (uint8_t*) p + n;
 227 }
 228
 229 /* Like startswith_no_case(), but operates on arbitrary memory blocks.
 230  * It works only for ASCII strings.
 231  */
 232 static inline void *memory_startswith_no_case(const void *p, size_t sz, const char *token) {
 233         assert(token);
 234
 235         size_t n = strlen(token);
 236         if (sz < n)
 237                 return NULL;
 238
 239         assert(p);
 240
 241         for (size_t i = 0; i < n; i++)
 242                 if (ascii_tolower(((char *)p)[i]) != ascii_tolower(token[i]))
 243                         return NULL;
 244
 245         return (uint8_t*) p + n;
 246 }
 247
 248 static inline char* str_realloc(char **p) {
 249         /* Reallocate *p to actual size */
 250
 251         if (!*p)
 252                 return NULL;
 253
 254         char *t = realloc(*p, strlen(*p) + 1);
 255         if (!t)
 256                 return NULL;
 257
 258         return (*p = t);
 259 }
 260
 261 char* string_erase(char *x);
 262
 263 int string_truncate_lines(const char *s, size_t n_lines, char **ret);
 264 int string_extract_line(const char *s, size_t i, char **ret);
 265
 266 int string_contains_word_strv(const char *string, const char *separators, char **words, const char **ret_word);
 267 static inline int string_contains_word(const char *string, const char *separators, const char *word) {
 268         return string_contains_word_strv(string, separators, STRV_MAKE(word), NULL);
 269 }