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authorJohannes Schindelin <johannes.schindelin@gmx.de>2017-08-08 16:46:39 +0200
committerDenys Vlasenko <vda.linux@googlemail.com>2017-08-09 13:52:17 +0200
commit3bef5d89b0c667e9fb7d1d9b44ba9b30d4d084e4 (patch)
tree5f31bceb5e2b239d88f6465cc76f313a4d5ddc98
parent5856dc74be79fa288f481e1f19077518ae6d8303 (diff)
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ash: implement -d DELIM option for read
The POSIX standard only requires the read builtin to handle -r: http://pubs.opengroup.org/onlinepubs/9699919799/utilities/read.html However, Bash introduced the option -d <DELIM> to override IFS for just one invocation, and it is quite useful. It is also super easy to implement in BusyBox' ash, so let's do that. The motivation: This option is used by Git's test suite. function old new delta .rodata 163505 163587 +82 shell_builtin_read 1244 1289 +45 readcmd 233 259 +26 builtin_read 258 263 +5 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 4/0 up/down: 158/0) Total: 158 bytes Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat
-rw-r--r--shell/ash.c15
-rw-r--r--shell/shell_common.c10
-rw-r--r--shell/shell_common.h3
3 files changed, 21 insertions, 7 deletions
diff --git a/shell/ash.c b/shell/ash.c
index 6dc1cfef7..fd1772351 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -189,6 +189,8 @@
189#define BASH_HOSTNAME_VAR ENABLE_ASH_BASH_COMPAT 189#define BASH_HOSTNAME_VAR ENABLE_ASH_BASH_COMPAT
190#define BASH_SHLVL_VAR ENABLE_ASH_BASH_COMPAT 190#define BASH_SHLVL_VAR ENABLE_ASH_BASH_COMPAT
191#define BASH_XTRACEFD ENABLE_ASH_BASH_COMPAT 191#define BASH_XTRACEFD ENABLE_ASH_BASH_COMPAT
192#define BASH_READ_D ENABLE_ASH_BASH_COMPAT
193#define IF_BASH_READ_D IF_ASH_BASH_COMPAT
192 194
193#if defined(__ANDROID_API__) && __ANDROID_API__ <= 24 195#if defined(__ANDROID_API__) && __ANDROID_API__ <= 24
194/* Bionic at least up to version 24 has no glob() */ 196/* Bionic at least up to version 24 has no glob() */
@@ -13402,10 +13404,10 @@ letcmd(int argc UNUSED_PARAM, char **argv)
13402 * -p PROMPT Display PROMPT on stderr (if input is from tty) 13404 * -p PROMPT Display PROMPT on stderr (if input is from tty)
13403 * -t SECONDS Timeout after SECONDS (tty or pipe only) 13405 * -t SECONDS Timeout after SECONDS (tty or pipe only)
13404 * -u FD Read from given FD instead of fd 0 13406 * -u FD Read from given FD instead of fd 0
13407 * -d DELIM End on DELIM char, not newline
13405 * This uses unbuffered input, which may be avoidable in some cases. 13408 * This uses unbuffered input, which may be avoidable in some cases.
13406 * TODO: bash also has: 13409 * TODO: bash also has:
13407 * -a ARRAY Read into array[0],[1],etc 13410 * -a ARRAY Read into array[0],[1],etc
13408 * -d DELIM End on DELIM char, not newline
13409 * -e Use line editing (tty only) 13411 * -e Use line editing (tty only)
13410 */ 13412 */
13411static int FAST_FUNC 13413static int FAST_FUNC
@@ -13415,11 +13417,12 @@ readcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
13415 char *opt_p = NULL; 13417 char *opt_p = NULL;
13416 char *opt_t = NULL; 13418 char *opt_t = NULL;
13417 char *opt_u = NULL; 13419 char *opt_u = NULL;
13420 char *opt_d = NULL; /* optimized out if !BASH */
13418 int read_flags = 0; 13421 int read_flags = 0;
13419 const char *r; 13422 const char *r;
13420 int i; 13423 int i;
13421 13424
13422 while ((i = nextopt("p:u:rt:n:s")) != '\0') { 13425 while ((i = nextopt("p:u:rt:n:sd:")) != '\0') {
13423 switch (i) { 13426 switch (i) {
13424 case 'p': 13427 case 'p':
13425 opt_p = optionarg; 13428 opt_p = optionarg;
@@ -13439,6 +13442,11 @@ readcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
13439 case 'u': 13442 case 'u':
13440 opt_u = optionarg; 13443 opt_u = optionarg;
13441 break; 13444 break;
13445#if BASH_READ_D
13446 case 'd':
13447 opt_d = optionarg;
13448 break;
13449#endif
13442 default: 13450 default:
13443 break; 13451 break;
13444 } 13452 }
@@ -13456,7 +13464,8 @@ readcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
13456 opt_n, 13464 opt_n,
13457 opt_p, 13465 opt_p,
13458 opt_t, 13466 opt_t,
13459 opt_u 13467 opt_u,
13468 opt_d
13460 ); 13469 );
13461 INT_ON; 13470 INT_ON;
13462 13471
diff --git a/shell/shell_common.c b/shell/shell_common.c
index a9f8d8413..2db8ea3e2 100644
--- a/shell/shell_common.c
+++ b/shell/shell_common.c
@@ -54,7 +54,8 @@ shell_builtin_read(void FAST_FUNC (*setvar)(const char *name, const char *val),
54 const char *opt_n, 54 const char *opt_n,
55 const char *opt_p, 55 const char *opt_p,
56 const char *opt_t, 56 const char *opt_t,
57 const char *opt_u 57 const char *opt_u,
58 const char *opt_d
58) 59)
59{ 60{
60 struct pollfd pfd[1]; 61 struct pollfd pfd[1];
@@ -237,14 +238,17 @@ shell_builtin_read(void FAST_FUNC (*setvar)(const char *name, const char *val),
237 continue; 238 continue;
238 } 239 }
239 } 240 }
240 if (c == '\n') 241 if (opt_d) {
242 if (c == *opt_d)
243 break;
244 } else if (c == '\n')
241 break; 245 break;
242 246
243 /* $IFS splitting. NOT done if we run "read" 247 /* $IFS splitting. NOT done if we run "read"
244 * without variable names (bash compat). 248 * without variable names (bash compat).
245 * Thus, "read" and "read REPLY" are not the same. 249 * Thus, "read" and "read REPLY" are not the same.
246 */ 250 */
247 if (argv[0]) { 251 if (!opt_d && argv[0]) {
248/* http://www.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_06_05 */ 252/* http://www.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_06_05 */
249 const char *is_ifs = strchr(ifs, c); 253 const char *is_ifs = strchr(ifs, c);
250 if (startword && is_ifs) { 254 if (startword && is_ifs) {
diff --git a/shell/shell_common.h b/shell/shell_common.h
index a82535c86..1b79bffca 100644
--- a/shell/shell_common.h
+++ b/shell/shell_common.h
@@ -42,7 +42,8 @@ shell_builtin_read(void FAST_FUNC (*setvar)(const char *name, const char *val),
42 const char *opt_n, 42 const char *opt_n,
43 const char *opt_p, 43 const char *opt_p,
44 const char *opt_t, 44 const char *opt_t,
45 const char *opt_u 45 const char *opt_u,
46 const char *opt_d
46); 47);
47 48
48int FAST_FUNC 49int FAST_FUNC
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-03-18 13:29:58 +0000