fish-shell/src/null_terminated_array.cpp

#include "null_terminated_array.h"

std::vector<std::string> wide_string_list_to_narrow(const wcstring_list_t &strs) {
    std::vector<std::string> res;
    res.reserve(strs.size());
    for (const wcstring &s : strs) {
        res.push_back(wcs2string(s));
    }
    return res;
}
Migrate a bunch of code out of common.h Put it into wcstringutil, path, or a new file null_terminated_array. 2020-01-15 21:16:43 +00:00			`#include "null_terminated_array.h"`

Rework null terminated arrays Several functions including wgetopt and execve operate on null-terminated arrays of nul-terminated pointers: a list of pointers to C strings where the last pointer is null. Prior to this change, each process_t stored its argv in such an array. This had two problems: 1. It was awkward to work with this type, instead of using std::vector, etc. 2. The process's arguments would be rearranged by builtins which is surprising Our null terminated arrays were built around a fancy type that would copy input strings and also generate an array of pointers to them, in one big allocation. Switch to a new model where we construct an array of pointers over existing strings. So you can supply a `vector<string>` and now `null_terminated_array_t` will just make a list of pointers to them. Now processes can just store their argv in a familiar wcstring_list_t. 2021-02-14 21:15:29 +00:00			`std::vector<std::string> wide_string_list_to_narrow(const wcstring_list_t &strs) {`
			`std::vector<std::string> res;`
			`res.reserve(strs.size());`
			`for (const wcstring &s : strs) {`
			`res.push_back(wcs2string(s));`
Migrate a bunch of code out of common.h Put it into wcstringutil, path, or a new file null_terminated_array. 2020-01-15 21:16:43 +00:00			`}`
Rework null terminated arrays Several functions including wgetopt and execve operate on null-terminated arrays of nul-terminated pointers: a list of pointers to C strings where the last pointer is null. Prior to this change, each process_t stored its argv in such an array. This had two problems: 1. It was awkward to work with this type, instead of using std::vector, etc. 2. The process's arguments would be rearranged by builtins which is surprising Our null terminated arrays were built around a fancy type that would copy input strings and also generate an array of pointers to them, in one big allocation. Switch to a new model where we construct an array of pointers over existing strings. So you can supply a `vector<string>` and now `null_terminated_array_t` will just make a list of pointers to them. Now processes can just store their argv in a familiar wcstring_list_t. 2021-02-14 21:15:29 +00:00			`return res;`
Migrate a bunch of code out of common.h Put it into wcstringutil, path, or a new file null_terminated_array. 2020-01-15 21:16:43 +00:00			`}`