80 lines
3.1 KiB
C
80 lines
3.1 KiB
C
#ifndef __wasi_libc_find_relpath_h
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#define __wasi_libc_find_relpath_h
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* Look up the given `path`, relative to the cwd, in the preopened directory
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* map. If a suitable entry is found, then the file descriptor for that entry
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* is returned. Additionally the absolute path of the directory's file
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* descriptor is returned in `abs_prefix` and the relative portion that needs
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* to be opened is stored in `*relative_path`.
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*
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* The `relative_path` argument must be a pointer to a buffer valid for
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* `relative_path_len` bytes, and this may be used as storage for the relative
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* portion of the path being returned through `*relative_path`.
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*
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* See documentation on `__wasilibc_find_abspath` for more info about what the
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* paths look like.
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*
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* Returns -1 on failure. Errno is set to either:
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*
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* * ENOMEM - failed to allocate memory for internal routines.
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* * ENOENT - the `path` could not be found relative to any preopened dir.
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* * ERANGE - the `relative_path` buffer is too small to hold the relative path.
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*/
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int __wasilibc_find_relpath(const char *path,
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const char **__restrict__ abs_prefix,
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char **relative_path,
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size_t relative_path_len);
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/**
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* Look up the given `path`, which is interpreted as absolute, in the preopened
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* directory map. If a suitable entry is found, then the file descriptor for
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* that entry is returned. Additionally the relative portion of the path to
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* where the fd is opened is returned through `relative_path`, the absolute
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* prefix which was matched is stored to `abs_prefix`, and `relative_path` may
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* be an interior pointer to the `abspath` string.
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*
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* The `abs_prefix` returned string will not contain a leading `/`. Note that
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* this may be the empty string. Additionally the returned `relative_path` will
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* not contain a leading `/`. The `relative_path` return will not return an
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* empty string, it will return `"."` instead if it would otherwise do so.
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*
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* Returns -1 on failure. Errno is set to either:
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*
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* * ENOMEM - failed to allocate memory for internal routines.
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* * ENOENT - the `path` could not be found relative to any preopened dir.
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*/
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int __wasilibc_find_abspath(const char *abspath,
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const char **__restrict__ abs_prefix,
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const char **__restrict__ relative_path);
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/**
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* Same as `__wasilibc_find_relpath`, except that this function will interpret
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* `relative` as a malloc'd buffer that will be `realloc`'d to the appropriate
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* size to contain the relative path.
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*
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* Note that this is a weak symbol and if it's not defined you can use
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* `__wasilibc_find_relpath`. The weak-nature of this symbols means that if it's
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* not otherwise included in the compilation then `chdir` wasn't used an there's
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* no need for this symbol.
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*
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* See documentation on `__wasilibc_find_relpath` for more information.
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*/
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int __wasilibc_find_relpath_alloc(
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const char *path,
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const char **abs,
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char **relative,
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size_t *relative_len,
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int can_realloc
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) __attribute__((__weak__));
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#ifdef __cplusplus
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}
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#endif
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#endif
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