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/*
* psftpcommon.c: front-end functionality shared between both file
* transfer tools across platforms. (As opposed to sftpcommon.c, which
* has *protocol*-level common code.)
*/
#include <stdlib.h>
#include <string.h>
#include "putty.h"
#include "ssh/sftp.h"
#include "psftp.h"
#define MAX_NAMES_MEMORY ((size_t)8 << 20)
/*
* qsort comparison routine for fxp_name structures. Sorts by real
* file name.
*/
int sftp_name_compare(const void *av, const void *bv)
{
const struct fxp_name *const *a = (const struct fxp_name *const *) av;
const struct fxp_name *const *b = (const struct fxp_name *const *) bv;
return strcmp((*a)->filename, (*b)->filename);
}
struct list_directory_from_sftp_ctx {
size_t nnames, namesize, total_memory;
struct fxp_name **names;
bool sorting;
};
struct list_directory_from_sftp_ctx *list_directory_from_sftp_new(void)
{
struct list_directory_from_sftp_ctx *ctx =
snew(struct list_directory_from_sftp_ctx);
memset(ctx, 0, sizeof(*ctx));
ctx->sorting = true;
return ctx;
}
void list_directory_from_sftp_free(struct list_directory_from_sftp_ctx *ctx)
{
for (size_t i = 0; i < ctx->nnames; i++)
fxp_free_name(ctx->names[i]);
sfree(ctx->names);
sfree(ctx);
}
void list_directory_from_sftp_feed(struct list_directory_from_sftp_ctx *ctx,
struct fxp_name *name)
{
if (ctx->sorting) {
/*
* Accumulate these filenames into an array that we'll sort -
* unless the array gets _really_ big, in which case, to avoid
* consuming all the client's memory, we fall back to
* outputting the directory listing unsorted.
*/
size_t this_name_memory =
sizeof(*ctx->names) + sizeof(**ctx->names) +
strlen(name->filename) +
strlen(name->longname);
if (MAX_NAMES_MEMORY - ctx->total_memory < this_name_memory) {
list_directory_from_sftp_warn_unsorted();
/* Output all the previously stored names. */
for (size_t i = 0; i < ctx->nnames; i++) {
list_directory_from_sftp_print(ctx->names[i]);
fxp_free_name(ctx->names[i]);
}
/* Don't store further names in that array. */
sfree(ctx->names);
ctx->names = NULL;
ctx->nnames = 0;
ctx->namesize = 0;
ctx->sorting = false;
/* And don't forget to output the name passed in this
* actual function call. */
list_directory_from_sftp_print(name);
} else {
sgrowarray(ctx->names, ctx->namesize, ctx->nnames);
ctx->names[ctx->nnames++] = fxp_dup_name(name);
ctx->total_memory += this_name_memory;
}
} else {
list_directory_from_sftp_print(name);
}
}
void list_directory_from_sftp_finish(struct list_directory_from_sftp_ctx *ctx)
{
if (ctx->nnames > 0) {
assert(ctx->sorting);
qsort(ctx->names, ctx->nnames, sizeof(*ctx->names), sftp_name_compare);
for (size_t i = 0; i < ctx->nnames; i++)
list_directory_from_sftp_print(ctx->names[i]);
}
}
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