tools/perf/util/string.c

   1 #include "util.h"
   2 #include "linux/string.h"
   3
   4 #define K 1024LL
   5 /*
   6  * perf_atoll()
   7  * Parse (\d+)(b|B|kb|KB|mb|MB|gb|GB|tb|TB) (e.g. "256MB")
   8  * and return its numeric value
   9  */
  10 s64 perf_atoll(const char *str)
  11 {
  12         s64 length;
  13         char *p;
  14         char c;
  15
  16         if (!isdigit(str[0]))
  17                 goto out_err;
  18
  19         length = strtoll(str, &p, 10);
  20         switch (c = *p++) {
  21                 case 'b': case 'B':
  22                         if (*p)
  23                                 goto out_err;
  24                 case '\0':
  25                         return length;
  26                 default:
  27                         goto out_err;
  28                 /* two-letter suffices */
  29                 case 'k': case 'K':
  30                         length <<= 10;
  31                         break;
  32                 case 'm': case 'M':
  33                         length <<= 20;
  34                         break;
  35                 case 'g': case 'G':
  36                         length <<= 30;
  37                         break;
  38                 case 't': case 'T':
  39                         length <<= 40;
  40                         break;
  41         }
  42         /* we want the cases to match */
  43         if (islower(c)) {
  44                 if (strcmp(p, "b") != 0)
  45                         goto out_err;
  46         } else {
  47                 if (strcmp(p, "B") != 0)
  48                         goto out_err;
  49         }
  50         return length;
  51
  52 out_err:
  53         return -1;
  54 }
  55
  56 /*
  57  * Helper function for splitting a string into an argv-like array.
  58  * originally copied from lib/argv_split.c
  59  */
  60 static const char *skip_sep(const char *cp)
  61 {
  62         while (*cp && isspace(*cp))
  63                 cp++;
  64
  65         return cp;
  66 }
  67
  68 static const char *skip_arg(const char *cp)
  69 {
  70         while (*cp && !isspace(*cp))
  71                 cp++;
  72
  73         return cp;
  74 }
  75
  76 static int count_argc(const char *str)
  77 {
  78         int count = 0;
  79
  80         while (*str) {
  81                 str = skip_sep(str);
  82                 if (*str) {
  83                         count++;
  84                         str = skip_arg(str);
  85                 }
  86         }
  87
  88         return count;
  89 }
  90
  91 /**
  92  * argv_free - free an argv
  93  * @argv - the argument vector to be freed
  94  *
  95  * Frees an argv and the strings it points to.
  96  */
  97 void argv_free(char **argv)
  98 {
  99         char **p;
 100         for (p = argv; *p; p++)
 101                 zfree(p);
 102
 103         free(argv);
 104 }
 105
 106 /**
 107  * argv_split - split a string at whitespace, returning an argv
 108  * @str: the string to be split
 109  * @argcp: returned argument count
 110  *
 111  * Returns an array of pointers to strings which are split out from
 112  * @str.  This is performed by strictly splitting on white-space; no
 113  * quote processing is performed.  Multiple whitespace characters are
 114  * considered to be a single argument separator.  The returned array
 115  * is always NULL-terminated.  Returns NULL on memory allocation
 116  * failure.
 117  */
 118 char **argv_split(const char *str, int *argcp)
 119 {
 120         int argc = count_argc(str);
 121         char **argv = zalloc(sizeof(*argv) * (argc+1));
 122         char **argvp;
 123
 124         if (argv == NULL)
 125                 goto out;
 126
 127         if (argcp)
 128                 *argcp = argc;
 129
 130         argvp = argv;
 131
 132         while (*str) {
 133                 str = skip_sep(str);
 134
 135                 if (*str) {
 136                         const char *p = str;
 137                         char *t;
 138
 139                         str = skip_arg(str);
 140
 141                         t = strndup(p, str-p);
 142                         if (t == NULL)
 143                                 goto fail;
 144                         *argvp++ = t;
 145                 }
 146         }
 147         *argvp = NULL;
 148
 149 out:
 150         return argv;
 151
 152 fail:
 153         argv_free(argv);
 154         return NULL;
 155 }
 156
 157 /* Character class matching */
 158 static bool __match_charclass(const char *pat, char c, const char **npat)
 159 {
 160         bool complement = false, ret = true;
 161
 162         if (*pat == '!') {
 163                 complement = true;
 164                 pat++;
 165         }
 166         if (*pat++ == c)        /* First character is special */
 167                 goto end;
 168
 169         while (*pat && *pat != ']') {   /* Matching */
 170                 if (*pat == '-' && *(pat + 1) != ']') { /* Range */
 171                         if (*(pat - 1) <= c && c <= *(pat + 1))
 172                                 goto end;
 173                         if (*(pat - 1) > *(pat + 1))
 174                                 goto error;
 175                         pat += 2;
 176                 } else if (*pat++ == c)
 177                         goto end;
 178         }
 179         if (!*pat)
 180                 goto error;
 181         ret = false;
 182
 183 end:
 184         while (*pat && *pat != ']')     /* Searching closing */
 185                 pat++;
 186         if (!*pat)
 187                 goto error;
 188         *npat = pat + 1;
 189         return complement ? !ret : ret;
 190
 191 error:
 192         return false;
 193 }
 194
 195 /* Glob/lazy pattern matching */
 196 static bool __match_glob(const char *str, const char *pat, bool ignore_space)
 197 {
 198         while (*str && *pat && *pat != '*') {
 199                 if (ignore_space) {
 200                         /* Ignore spaces for lazy matching */
 201                         if (isspace(*str)) {
 202                                 str++;
 203                                 continue;
 204                         }
 205                         if (isspace(*pat)) {
 206                                 pat++;
 207                                 continue;
 208                         }
 209                 }
 210                 if (*pat == '?') {      /* Matches any single character */
 211                         str++;
 212                         pat++;
 213                         continue;
 214                 } else if (*pat == '[') /* Character classes/Ranges */
 215                         if (__match_charclass(pat + 1, *str, &pat)) {
 216                                 str++;
 217                                 continue;
 218                         } else
 219                                 return false;
 220                 else if (*pat == '\\') /* Escaped char match as normal char */
 221                         pat++;
 222                 if (*str++ != *pat++)
 223                         return false;
 224         }
 225         /* Check wild card */
 226         if (*pat == '*') {
 227                 while (*pat == '*')
 228                         pat++;
 229                 if (!*pat)      /* Tail wild card matches all */
 230                         return true;
 231                 while (*str)
 232                         if (__match_glob(str++, pat, ignore_space))
 233                                 return true;
 234         }
 235         return !*str && !*pat;
 236 }
 237
 238 /**
 239  * strglobmatch - glob expression pattern matching
 240  * @str: the target string to match
 241  * @pat: the pattern string to match
 242  *
 243  * This returns true if the @str matches @pat. @pat can includes wildcards
 244  * ('*','?') and character classes ([CHARS], complementation and ranges are
 245  * also supported). Also, this supports escape character ('\') to use special
 246  * characters as normal character.
 247  *
 248  * Note: if @pat syntax is broken, this always returns false.
 249  */
 250 bool strglobmatch(const char *str, const char *pat)
 251 {
 252         return __match_glob(str, pat, false);
 253 }
 254
 255 /**
 256  * strlazymatch - matching pattern strings lazily with glob pattern
 257  * @str: the target string to match
 258  * @pat: the pattern string to match
 259  *
 260  * This is similar to strglobmatch, except this ignores spaces in
 261  * the target string.
 262  */
 263 bool strlazymatch(const char *str, const char *pat)
 264 {
 265         return __match_glob(str, pat, true);
 266 }
 267
 268 /**
 269  * strtailcmp - Compare the tail of two strings
 270  * @s1: 1st string to be compared
 271  * @s2: 2nd string to be compared
 272  *
 273  * Return 0 if whole of either string is same as another's tail part.
 274  */
 275 int strtailcmp(const char *s1, const char *s2)
 276 {
 277         int i1 = strlen(s1);
 278         int i2 = strlen(s2);
 279         while (--i1 >= 0 && --i2 >= 0) {
 280                 if (s1[i1] != s2[i2])
 281                         return s1[i1] - s2[i2];
 282         }
 283         return 0;
 284 }
 285
 286 /**
 287  * strxfrchar - Locate and replace character in @s
 288  * @s:    The string to be searched/changed.
 289  * @from: Source character to be replaced.
 290  * @to:   Destination character.
 291  *
 292  * Return pointer to the changed string.
 293  */
 294 char *strxfrchar(char *s, char from, char to)
 295 {
 296         char *p = s;
 297
 298         while ((p = strchr(p, from)) != NULL)
 299                 *p++ = to;
 300
 301         return s;
 302 }
 303
 304 /**
 305  * ltrim - Removes leading whitespace from @s.
 306  * @s: The string to be stripped.
 307  *
 308  * Return pointer to the first non-whitespace character in @s.
 309  */
 310 char *ltrim(char *s)
 311 {
 312         int len = strlen(s);
 313
 314         while (len && isspace(*s)) {
 315                 len--;
 316                 s++;
 317         }
 318
 319         return s;
 320 }
 321
 322 /**
 323  * rtrim - Removes trailing whitespace from @s.
 324  * @s: The string to be stripped.
 325  *
 326  * Note that the first trailing whitespace is replaced with a %NUL-terminator
 327  * in the given string @s. Returns @s.
 328  */
 329 char *rtrim(char *s)
 330 {
 331         size_t size = strlen(s);
 332         char *end;
 333
 334         if (!size)
 335                 return s;
 336
 337         end = s + size - 1;
 338         while (end >= s && isspace(*end))
 339                 end--;
 340         *(end + 1) = '\0';
 341
 342         return s;
 343 }
 344
 345 /**
 346  * memdup - duplicate region of memory
 347  * @src: memory region to duplicate
 348  * @len: memory region length
 349  */
 350 void *memdup(const void *src, size_t len)
 351 {
 352         void *p;
 353
 354         p = malloc(len);
 355         if (p)
 356                 memcpy(p, src, len);
 357
 358         return p;
 359 }