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In load-buffer, read until EOF rather than using stat() and reading a fixed

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size. Allows use of FIFOs and whatnot. From Tiago Cunha, idea from Fulvio
Ciriaco.
This commit is contained in:
Nicholas Marriott 2010-02-22 20:33:12 +00:00
parent 73b8c3ebf3
commit efbcf8747d
1 changed files with 18 additions and 27 deletions
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45
cmd-load-buffer.c
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@ -16,13 +16,10 @@
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "tmux.h"
@ -48,11 +45,11 @@ cmd_load_buffer_exec(struct cmd *self, struct cmd_ctx *ctx)
{
struct cmd_buffer_data *data = self->data;
struct session *s;
struct stat sb;
FILE *f;
char *pdata = NULL;
char *pdata, *new_pdata;
size_t psize;
u_int limit;
int ch;
if ((s = cmd_find_session(ctx, data->target)) == NULL)
return (-1);
@ -62,29 +59,23 @@ cmd_load_buffer_exec(struct cmd *self, struct cmd_ctx *ctx)
return (-1);
}
if (fstat(fileno(f), &sb) < 0) {
ctx->error(ctx, "%s: %s", data->arg, strerror(errno));
goto error;
}
if (sb.st_size <= 0 || (uintmax_t) sb.st_size > SIZE_MAX) {
ctx->error(ctx, "%s: file empty or too large", data->arg);
goto error;
}
psize = (size_t) sb.st_size;
/*
* We don't want to die due to memory exhaustion, hence xmalloc can't
* be used here.
*/
if ((pdata = malloc(psize)) == NULL) {
ctx->error(ctx, "malloc error: %s", strerror(errno));
goto error;
}
if (fread(pdata, 1, psize, f) != psize) {
ctx->error(ctx, "%s: fread error", data->arg);
pdata = NULL;
psize = 0;
while ((ch = getc(f)) != EOF) {
/* Do not let the server die due to memory exhaustion. */
if ((new_pdata = realloc(pdata, psize + 2)) == NULL) {
ctx->error(ctx, "realloc error: %s", strerror(errno));
goto error;
}
pdata = new_pdata;
pdata[psize++] = ch;
}
if (ferror(f)) {
ctx->error(ctx, "%s: read error", data->arg);
goto error;
}
if (pdata != NULL)
pdata[psize] = '\0';
fclose(f);