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tools: bpftool: support continuation lines in batch files 

Add support for continuation lines, such as in the following example:

    prog show
    prog dump xlated \
        id 1337 opcodes

This patch is based after the code for support for continuation lines
from file lib/utils.c from package iproute2.

"Lines" in error messages are renamed as "commands", as we count the
number of commands (but we ignore empty lines, comments, and do not add
continuation lines to the count).

Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com>
Acked-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Quentin Monnet 2018-03-01 20:20:09 -08:00 committed by Daniel Borkmann
parent 06cc7fe7c2
commit 65d538dde6
1 changed files with 32 additions and 4 deletions
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36
tools/bpf/bpftool/main.c
View File

@ -46,6 +46,9 @@
#include "main.h"
#define BATCH_LINE_LEN_MAX 65536
#define BATCH_ARG_NB_MAX 4096
const char *bin_name;
static int last_argc;
static char **last_argv;
@ -171,9 +174,9 @@ static const struct cmd cmds[] = {
static int do_batch(int argc, char **argv)
{
char buf[BATCH_LINE_LEN_MAX], contline[BATCH_LINE_LEN_MAX];
char *n_argv[BATCH_ARG_NB_MAX];
unsigned int lines = 0;
char *n_argv[4096];
char buf[65536];
int n_argc;
FILE *fp;
char *cp;
@ -210,13 +213,38 @@ static int do_batch(int argc, char **argv)
break;
}
/* Append continuation lines if any (coming after a line ending
* with '\' in the batch file).
*/
while ((cp = strstr(buf, "\\\n")) != NULL) {
if (!fgets(contline, sizeof(contline), fp) ||
strlen(contline) == 0) {
p_err("missing continuation line on command %d",
lines);
err = -1;
goto err_close;
}
cp = strchr(contline, '#');
if (cp)
*cp = '\0';
if (strlen(buf) + strlen(contline) + 1 > sizeof(buf)) {
p_err("command %d is too long", lines);
err = -1;
goto err_close;
}
buf[strlen(buf) - 2] = '\0';
strcat(buf, contline);
}
n_argc = 0;
n_argv[n_argc] = strtok(buf, " \t\n");
while (n_argv[n_argc]) {
n_argc++;
if (n_argc == ARRAY_SIZE(n_argv)) {
p_err("line %d has too many arguments, skip",
p_err("command %d has too many arguments, skip",
lines);
n_argc = 0;
break;
@ -252,7 +280,7 @@ static int do_batch(int argc, char **argv)
p_err("reading batch file failed: %s", strerror(errno));
err = -1;
} else {
p_info("processed %d lines", lines);
p_info("processed %d commands", lines);
err = 0;
}
err_close: