userdiff.c

   1 #include "git-compat-util.h"
   2 #include "alloc.h"
   3 #include "config.h"
   4 #include "userdiff.h"
   5 #include "attr.h"
   6 #include "strbuf.h"
   7
   8 static struct userdiff_driver *drivers;
   9 static int ndrivers;
  10 static int drivers_alloc;
  11
  12 #define PATTERNS(lang, rx, wrx) { \
  13         .name = lang, \
  14         .binary = -1, \
  15         .funcname = { \
  16                 .pattern = rx, \
  17                 .cflags = REG_EXTENDED, \
  18         }, \
  19         .word_regex = wrx "|[^[:space:]]|[\xc0-\xff][\x80-\xbf]+", \
  20 }
  21 #define IPATTERN(lang, rx, wrx) { \
  22         .name = lang, \
  23         .binary = -1, \
  24         .funcname = { \
  25                 .pattern = rx, \
  26                 .cflags = REG_EXTENDED | REG_ICASE, \
  27         }, \
  28         .word_regex = wrx "|[^[:space:]]|[\xc0-\xff][\x80-\xbf]+", \
  29 }
  30
  31 /*
  32  * Built-in drivers for various languages, sorted by their names
  33  * (except that the "default" is left at the end).
  34  *
  35  * When writing or updating patterns, assume that the contents these
  36  * patterns are applied to are syntactically correct.  The patterns
  37  * can be simple without implementing all syntactical corner cases, as
  38  * long as they are sufficiently permissive.
  39  */
  40 static struct userdiff_driver builtin_drivers[] = {
  41 IPATTERN("ada",
  42          "!^(.*[ \t])?(is[ \t]+new|renames|is[ \t]+separate)([ \t].*)?$\n"
  43          "!^[ \t]*with[ \t].*$\n"
  44          "^[ \t]*((procedure|function)[ \t]+.*)$\n"
  45          "^[ \t]*((package|protected|task)[ \t]+.*)$",
  46          /* -- */
  47          "[a-zA-Z][a-zA-Z0-9_]*"
  48          "|[-+]?[0-9][0-9#_.aAbBcCdDeEfF]*([eE][+-]?[0-9_]+)?"
  49          "|=>|\\.\\.|\\*\\*|:=|/=|>=|<=|<<|>>|<>"),
  50 PATTERNS("bash",
  51          /* Optional leading indentation */
  52          "^[ \t]*"
  53          /* Start of captured text */
  54          "("
  55          "("
  56              /* POSIX identifier with mandatory parentheses */
  57              "[a-zA-Z_][a-zA-Z0-9_]*[ \t]*\\([ \t]*\\))"
  58          "|"
  59              /* Bashism identifier with optional parentheses */
  60              "(function[ \t]+[a-zA-Z_][a-zA-Z0-9_]*(([ \t]*\\([ \t]*\\))|([ \t]+))"
  61          ")"
  62          /* Optional whitespace */
  63          "[ \t]*"
  64          /* Compound command starting with `{`, `(`, `((` or `[[` */
  65          "(\\{|\\(\\(?|\\[\\[)"
  66          /* End of captured text */
  67          ")",
  68          /* -- */
  69          /* Characters not in the default $IFS value */
  70          "[^ \t]+"),
  71 PATTERNS("bibtex",
  72          "(@[a-zA-Z]{1,}[ \t]*\\{{0,1}[ \t]*[^ \t\"@',\\#}{~%]*).*$",
  73          /* -- */
  74          "[={}\"]|[^={}\" \t]+"),
  75 PATTERNS("cpp",
  76          /* Jump targets or access declarations */
  77          "!^[ \t]*[A-Za-z_][A-Za-z_0-9]*:[[:space:]]*($|/[/*])\n"
  78          /* functions/methods, variables, and compounds at top level */
  79          "^((::[[:space:]]*)?[A-Za-z_].*)$",
  80          /* -- */
  81          /* identifiers and keywords */
  82          "[a-zA-Z_][a-zA-Z0-9_]*"
  83          /* decimal and octal integers as well as floatingpoint numbers */
  84          "|[0-9][0-9.]*([Ee][-+]?[0-9]+)?[fFlLuU]*"
  85          /* hexadecimal and binary integers */
  86          "|0[xXbB][0-9a-fA-F]+[lLuU]*"
  87          /* floatingpoint numbers that begin with a decimal point */
  88          "|\\.[0-9][0-9]*([Ee][-+]?[0-9]+)?[fFlL]?"
  89          "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->\\*?|\\.\\*|<=>"),
  90 PATTERNS("csharp",
  91          /* Keywords */
  92          "!^[ \t]*(do|while|for|if|else|instanceof|new|return|switch|case|throw|catch|using)\n"
  93          /* Methods and constructors */
  94          "^[ \t]*(((static|public|internal|private|protected|new|virtual|sealed|override|unsafe|async)[ \t]+)*[][<>@.~_[:alnum:]]+[ \t]+[<>@._[:alnum:]]+[ \t]*\\(.*\\))[ \t]*$\n"
  95          /* Properties */
  96          "^[ \t]*(((static|public|internal|private|protected|new|virtual|sealed|override|unsafe)[ \t]+)*[][<>@.~_[:alnum:]]+[ \t]+[@._[:alnum:]]+)[ \t]*$\n"
  97          /* Type definitions */
  98          "^[ \t]*(((static|public|internal|private|protected|new|unsafe|sealed|abstract|partial)[ \t]+)*(class|enum|interface|struct|record)[ \t]+.*)$\n"
  99          /* Namespace */
 100          "^[ \t]*(namespace[ \t]+.*)$",
 101          /* -- */
 102          "[a-zA-Z_][a-zA-Z0-9_]*"
 103          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
 104          "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"),
 105 IPATTERN("css",
 106          "![:;][[:space:]]*$\n"
 107          "^[:[@.#]?[_a-z0-9].*$",
 108          /* -- */
 109          /*
 110           * This regex comes from W3C CSS specs. Should theoretically also
 111           * allow ISO 10646 characters U+00A0 and higher,
 112           * but they are not handled in this regex.
 113           */
 114          "-?[_a-zA-Z][-_a-zA-Z0-9]*" /* identifiers */
 115          "|-?[0-9]+|\\#[0-9a-fA-F]+" /* numbers */
 116 ),
 117 PATTERNS("dts",
 118          "!;\n"
 119          "!=\n"
 120          /* lines beginning with a word optionally preceded by '&' or the root */
 121          "^[ \t]*((/[ \t]*\\{|&?[a-zA-Z_]).*)",
 122          /* -- */
 123          /* Property names and math operators */
 124          "[a-zA-Z0-9,._+?#-]+"
 125          "|[-+*/%&^|!~]|>>|<<|&&|\\|\\|"),
 126 PATTERNS("elixir",
 127          "^[ \t]*((def(macro|module|impl|protocol|p)?|test)[ \t].*)$",
 128          /* -- */
 129          /* Atoms, names, and module attributes */
 130          "[@:]?[a-zA-Z0-9@_?!]+"
 131          /* Numbers with specific base */
 132          "|[-+]?0[xob][0-9a-fA-F]+"
 133          /* Numbers */
 134          "|[-+]?[0-9][0-9_.]*([eE][-+]?[0-9_]+)?"
 135          /* Operators and atoms that represent them */
 136          "|:?(\\+\\+|--|\\.\\.|~~~|<>|\\^\\^\\^|<?\\|>|<<<?|>?>>|<<?~|~>?>|<~>|<=|>=|===?|!==?|=~|&&&?|\\|\\|\\|?|=>|<-|\\\\\\\\|->)"
 137          /* Not real operators, but should be grouped */
 138          "|:?%[A-Za-z0-9_.]\\{\\}?"),
 139 IPATTERN("fortran",
 140          /* Don't match comment lines */
 141          "!^([C*]|[ \t]*!)\n"
 142          /* Don't match 'module procedure' lines */
 143          "!^[ \t]*MODULE[ \t]+PROCEDURE[ \t]\n"
 144          /* Program, module, block data */
 145          "^[ \t]*((END[ \t]+)?(PROGRAM|MODULE|BLOCK[ \t]+DATA"
 146                 /* Subroutines and functions */
 147                 "|([^!'\" \t]+[ \t]+)*(SUBROUTINE|FUNCTION))[ \t]+[A-Z].*)$",
 148          /* -- */
 149          "[a-zA-Z][a-zA-Z0-9_]*"
 150          "|\\.([Ee][Qq]|[Nn][Ee]|[Gg][TtEe]|[Ll][TtEe]|[Tt][Rr][Uu][Ee]|[Ff][Aa][Ll][Ss][Ee]|[Aa][Nn][Dd]|[Oo][Rr]|[Nn]?[Ee][Qq][Vv]|[Nn][Oo][Tt])\\."
 151          /* numbers and format statements like 2E14.4, or ES12.6, 9X.
 152           * Don't worry about format statements without leading digits since
 153           * they would have been matched above as a variable anyway. */
 154          "|[-+]?[0-9.]+([AaIiDdEeFfLlTtXx][Ss]?[-+]?[0-9.]*)?(_[a-zA-Z0-9][a-zA-Z0-9_]*)?"
 155          "|//|\\*\\*|::|[/<>=]="),
 156 IPATTERN("fountain",
 157          "^((\\.[^.]|(int|ext|est|int\\.?/ext|i/e)[. ]).*)$",
 158          /* -- */
 159          "[^ \t-]+"),
 160 PATTERNS("golang",
 161          /* Functions */
 162          "^[ \t]*(func[ \t]*.*(\\{[ \t]*)?)\n"
 163          /* Structs and interfaces */
 164          "^[ \t]*(type[ \t].*(struct|interface)[ \t]*(\\{[ \t]*)?)",
 165          /* -- */
 166          "[a-zA-Z_][a-zA-Z0-9_]*"
 167          "|[-+0-9.eE]+i?|0[xX]?[0-9a-fA-F]+i?"
 168          "|[-+*/<>%&^|=!:]=|--|\\+\\+|<<=?|>>=?|&\\^=?|&&|\\|\\||<-|\\.{3}"),
 169 PATTERNS("html",
 170          "^[ \t]*(<[Hh][1-6]([ \t].*)?>.*)$",
 171          /* -- */
 172          "[^<>= \t]+"),
 173 PATTERNS("java",
 174          "!^[ \t]*(catch|do|for|if|instanceof|new|return|switch|throw|while)\n"
 175          /* Class, enum, interface, and record declarations */
 176          "^[ \t]*(([a-z-]+[ \t]+)*(class|enum|interface|record)[ \t]+.*)$\n"
 177          /* Method definitions; note that constructor signatures are not */
 178          /* matched because they are indistinguishable from method calls. */
 179          "^[ \t]*(([A-Za-z_<>&][][?&<>.,A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$",
 180          /* -- */
 181          "[a-zA-Z_][a-zA-Z0-9_]*"
 182          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
 183          "|[-+*/<>%&^|=!]="
 184          "|--|\\+\\+|<<=?|>>>?=?|&&|\\|\\|"),
 185 PATTERNS("kotlin",
 186          "^[ \t]*(([a-z]+[ \t]+)*(fun|class|interface)[ \t]+.*)$",
 187          /* -- */
 188          "[a-zA-Z_][a-zA-Z0-9_]*"
 189          /* hexadecimal and binary numbers */
 190          "|0[xXbB][0-9a-fA-F_]+[lLuU]*"
 191          /* integers and floats */
 192          "|[0-9][0-9_]*([.][0-9_]*)?([Ee][-+]?[0-9]+)?[fFlLuU]*"
 193          /* floating point numbers beginning with decimal point */
 194          "|[.][0-9][0-9_]*([Ee][-+]?[0-9]+)?[fFlLuU]?"
 195          /* unary and binary operators */
 196          "|[-+*/<>%&^|=!]==?|--|\\+\\+|<<=|>>=|&&|\\|\\||->|\\.\\*|!!|[?:.][.:]"),
 197 PATTERNS("markdown",
 198          "^ {0,3}#{1,6}[ \t].*",
 199          /* -- */
 200          "[^<>= \t]+"),
 201 PATTERNS("matlab",
 202          /*
 203           * Octave pattern is mostly the same as matlab, except that '%%%' and
 204           * '##' can also be used to begin code sections, in addition to '%%'
 205           * that is understood by both.
 206           */
 207          "^[[:space:]]*((classdef|function)[[:space:]].*)$|^(%%%?|##)[[:space:]].*$",
 208          /* -- */
 209          "[a-zA-Z_][a-zA-Z0-9_]*|[-+0-9.e]+|[=~<>]=|\\.[*/\\^']|\\|\\||&&"),
 210 PATTERNS("objc",
 211          /* Negate C statements that can look like functions */
 212          "!^[ \t]*(do|for|if|else|return|switch|while)\n"
 213          /* Objective-C methods */
 214          "^[ \t]*([-+][ \t]*\\([ \t]*[A-Za-z_][A-Za-z_0-9* \t]*\\)[ \t]*[A-Za-z_].*)$\n"
 215          /* C functions */
 216          "^[ \t]*(([A-Za-z_][A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$\n"
 217          /* Objective-C class/protocol definitions */
 218          "^(@(implementation|interface|protocol)[ \t].*)$",
 219          /* -- */
 220          "[a-zA-Z_][a-zA-Z0-9_]*"
 221          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
 222          "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"),
 223 PATTERNS("pascal",
 224          "^(((class[ \t]+)?(procedure|function)|constructor|destructor|interface"
 225          "|implementation|initialization|finalization)[ \t]*.*)$\n"
 226          "^(.*=[ \t]*(class|record).*)$",
 227          /* -- */
 228          "[a-zA-Z_][a-zA-Z0-9_]*"
 229          "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
 230          "|<>|<=|>=|:=|\\.\\."),
 231 PATTERNS("perl",
 232          "^package .*\n"
 233          "^sub [[:alnum:]_':]+[ \t]*"
 234                 "(\\([^)]*\\)[ \t]*)?" /* prototype */
 235                 /*
 236                  * Attributes.  A regex can't count nested parentheses,
 237                  * so just slurp up whatever we see, taking care not
 238                  * to accept lines like "sub foo; # defined elsewhere".
 239                  *
 240                  * An attribute could contain a semicolon, but at that
 241                  * point it seems reasonable enough to give up.
 242                  */
 243                 "(:[^;#]*)?"
 244                 "(\\{[ \t]*)?" /* brace can come here or on the next line */
 245                 "(#.*)?$\n" /* comment */
 246          "^(BEGIN|END|INIT|CHECK|UNITCHECK|AUTOLOAD|DESTROY)[ \t]*"
 247                 "(\\{[ \t]*)?" /* brace can come here or on the next line */
 248                 "(#.*)?$\n"
 249          "^=head[0-9] .*",      /* POD */
 250          /* -- */
 251          "[[:alpha:]_'][[:alnum:]_']*"
 252          "|0[xb]?[0-9a-fA-F_]*"
 253          /* taking care not to interpret 3..5 as (3.)(.5) */
 254          "|[0-9a-fA-F_]+(\\.[0-9a-fA-F_]+)?([eE][-+]?[0-9_]+)?"
 255          "|=>|-[rwxoRWXOezsfdlpSugkbctTBMAC>]|~~|::"
 256          "|&&=|\\|\\|=|//=|\\*\\*="
 257          "|&&|\\|\\||//|\\+\\+|--|\\*\\*|\\.\\.\\.?"
 258          "|[-+*/%.^&<>=!|]="
 259          "|=~|!~"
 260          "|<<|<>|<=>|>>"),
 261 PATTERNS("php",
 262          "^[\t ]*(((public|protected|private|static|abstract|final)[\t ]+)*function.*)$\n"
 263          "^[\t ]*((((final|abstract)[\t ]+)?class|enum|interface|trait).*)$",
 264          /* -- */
 265          "[a-zA-Z_][a-zA-Z0-9_]*"
 266          "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
 267          "|[-+*/<>%&^|=!.]=|--|\\+\\+|<<=?|>>=?|===|&&|\\|\\||::|->"),
 268 PATTERNS("python",
 269          "^[ \t]*((class|(async[ \t]+)?def)[ \t].*)$",
 270          /* -- */
 271          "[a-zA-Z_][a-zA-Z0-9_]*"
 272          "|[-+0-9.e]+[jJlL]?|0[xX]?[0-9a-fA-F]+[lL]?"
 273          "|[-+*/<>%&^|=!]=|//=?|<<=?|>>=?|\\*\\*=?"),
 274          /* -- */
 275 PATTERNS("ruby",
 276          "^[ \t]*((class|module|def)[ \t].*)$",
 277          /* -- */
 278          "(@|@@|\\$)?[a-zA-Z_][a-zA-Z0-9_]*"
 279          "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+|\\?(\\\\C-)?(\\\\M-)?."
 280          "|//=?|[-+*/<>%&^|=!]=|<<=?|>>=?|===|\\.{1,3}|::|[!=]~"),
 281 PATTERNS("rust",
 282          "^[\t ]*((pub(\\([^\\)]+\\))?[\t ]+)?((async|const|unsafe|extern([\t ]+\"[^\"]+\"))[\t ]+)?(struct|enum|union|mod|trait|fn|impl|macro_rules!)[< \t]+[^;]*)$",
 283          /* -- */
 284          "[a-zA-Z_][a-zA-Z0-9_]*"
 285          "|[0-9][0-9_a-fA-Fiosuxz]*(\\.([0-9]*[eE][+-]?)?[0-9_fF]*)?"
 286          "|[-+*\\/<>%&^|=!:]=|<<=?|>>=?|&&|\\|\\||->|=>|\\.{2}=|\\.{3}|::"),
 287 PATTERNS("scheme",
 288          "^[\t ]*(\\(((define|def(struct|syntax|class|method|rules|record|proto|alias)?)[-*/ \t]|(library|module|struct|class)[*+ \t]).*)$",
 289          /*
 290           * R7RS valid identifiers include any sequence enclosed
 291           * within vertical lines having no backslashes
 292           */
 293          "\\|([^\\\\]*)\\|"
 294          /* All other words should be delimited by spaces or parentheses */
 295          "|([^][)(}{[ \t])+"),
 296 PATTERNS("tex", "^(\\\\((sub)*section|chapter|part)\\*{0,1}\\{.*)$",
 297          "\\\\[a-zA-Z@]+|\\\\.|[a-zA-Z0-9\x80-\xff]+"),
 298 { "default", NULL, NULL, -1, { NULL, 0 } },
 299 };
 300 #undef PATTERNS
 301 #undef IPATTERN
 302
 303 static struct userdiff_driver driver_true = {
 304         .name = "diff=true",
 305         .binary = 0,
 306 };
 307
 308 static struct userdiff_driver driver_false = {
 309         .name = "!diff",
 310         .binary = 1,
 311 };
 312
 313 struct find_by_namelen_data {
 314         const char *name;
 315         size_t len;
 316         struct userdiff_driver *driver;
 317 };
 318
 319 static int userdiff_find_by_namelen_cb(struct userdiff_driver *driver,
 320                                        enum userdiff_driver_type type UNUSED,
 321                                        void *priv)
 322 {
 323         struct find_by_namelen_data *cb_data = priv;
 324
 325         if (!strncmp(driver->name, cb_data->name, cb_data->len) &&
 326             !driver->name[cb_data->len]) {
 327                 cb_data->driver = driver;
 328                 return 1; /* tell the caller to stop iterating */
 329         }
 330         return 0;
 331 }
 332
 333 static struct userdiff_driver *userdiff_find_by_namelen(const char *name, size_t len)
 334 {
 335         struct find_by_namelen_data udcbdata = {
 336                 .name = name,
 337                 .len = len,
 338         };
 339         for_each_userdiff_driver(userdiff_find_by_namelen_cb, &udcbdata);
 340         return udcbdata.driver;
 341 }
 342
 343 static int parse_funcname(struct userdiff_funcname *f, const char *k,
 344                 const char *v, int cflags)
 345 {
 346         if (git_config_string(&f->pattern, k, v) < 0)
 347                 return -1;
 348         f->cflags = cflags;
 349         return 0;
 350 }
 351
 352 static int parse_tristate(int *b, const char *k, const char *v)
 353 {
 354         if (v && !strcasecmp(v, "auto"))
 355                 *b = -1;
 356         else
 357                 *b = git_config_bool(k, v);
 358         return 0;
 359 }
 360
 361 static int parse_bool(int *b, const char *k, const char *v)
 362 {
 363         *b = git_config_bool(k, v);
 364         return 0;
 365 }
 366
 367 int userdiff_config(const char *k, const char *v)
 368 {
 369         struct userdiff_driver *drv;
 370         const char *name, *type;
 371         size_t namelen;
 372
 373         if (parse_config_key(k, "diff", &name, &namelen, &type) || !name)
 374                 return 0;
 375
 376         drv = userdiff_find_by_namelen(name, namelen);
 377         if (!drv) {
 378                 ALLOC_GROW(drivers, ndrivers+1, drivers_alloc);
 379                 drv = &drivers[ndrivers++];
 380                 memset(drv, 0, sizeof(*drv));
 381                 drv->name = xmemdupz(name, namelen);
 382                 drv->binary = -1;
 383         }
 384
 385         if (!strcmp(type, "funcname"))
 386                 return parse_funcname(&drv->funcname, k, v, 0);
 387         if (!strcmp(type, "xfuncname"))
 388                 return parse_funcname(&drv->funcname, k, v, REG_EXTENDED);
 389         if (!strcmp(type, "binary"))
 390                 return parse_tristate(&drv->binary, k, v);
 391         if (!strcmp(type, "command"))
 392                 return git_config_string(&drv->external, k, v);
 393         if (!strcmp(type, "textconv"))
 394                 return git_config_string(&drv->textconv, k, v);
 395         if (!strcmp(type, "cachetextconv"))
 396                 return parse_bool(&drv->textconv_want_cache, k, v);
 397         if (!strcmp(type, "wordregex"))
 398                 return git_config_string(&drv->word_regex, k, v);
 399         if (!strcmp(type, "algorithm"))
 400                 return git_config_string(&drv->algorithm, k, v);
 401
 402         return 0;
 403 }
 404
 405 struct userdiff_driver *userdiff_find_by_name(const char *name)
 406 {
 407         int len = strlen(name);
 408         return userdiff_find_by_namelen(name, len);
 409 }
 410
 411 struct userdiff_driver *userdiff_find_by_path(struct index_state *istate,
 412                                               const char *path)
 413 {
 414         static struct attr_check *check;
 415
 416         if (!check)
 417                 check = attr_check_initl("diff", NULL);
 418         if (!path)
 419                 return NULL;
 420         git_check_attr(istate, NULL, path, check);
 421
 422         if (ATTR_TRUE(check->items[0].value))
 423                 return &driver_true;
 424         if (ATTR_FALSE(check->items[0].value))
 425                 return &driver_false;
 426         if (ATTR_UNSET(check->items[0].value))
 427                 return NULL;
 428         return userdiff_find_by_name(check->items[0].value);
 429 }
 430
 431 struct userdiff_driver *userdiff_get_textconv(struct repository *r,
 432                                               struct userdiff_driver *driver)
 433 {
 434         if (!driver->textconv)
 435                 return NULL;
 436
 437         if (driver->textconv_want_cache && !driver->textconv_cache) {
 438                 struct notes_cache *c = xmalloc(sizeof(*c));
 439                 struct strbuf name = STRBUF_INIT;
 440
 441                 strbuf_addf(&name, "textconv/%s", driver->name);
 442                 notes_cache_init(r, c, name.buf, driver->textconv);
 443                 driver->textconv_cache = c;
 444                 strbuf_release(&name);
 445         }
 446
 447         return driver;
 448 }
 449
 450 static int for_each_userdiff_driver_list(each_userdiff_driver_fn fn,
 451                                          enum userdiff_driver_type type, void *cb_data,
 452                                          struct userdiff_driver *drv,
 453                                          int drv_size)
 454 {
 455         int i;
 456         int ret;
 457         for (i = 0; i < drv_size; i++) {
 458                 struct userdiff_driver *item = drv + i;
 459                 if ((ret = fn(item, type, cb_data)))
 460                         return ret;
 461         }
 462         return 0;
 463 }
 464
 465 int for_each_userdiff_driver(each_userdiff_driver_fn fn, void *cb_data)
 466 {
 467         int ret;
 468
 469         ret = for_each_userdiff_driver_list(fn, USERDIFF_DRIVER_TYPE_CUSTOM,
 470                                             cb_data, drivers, ndrivers);
 471         if (ret)
 472                 return ret;
 473
 474         ret = for_each_userdiff_driver_list(fn, USERDIFF_DRIVER_TYPE_BUILTIN,
 475                                             cb_data, builtin_drivers,
 476                                             ARRAY_SIZE(builtin_drivers));
 477         if (ret)
 478                 return ret;
 479
 480         return 0;
 481 }