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Subject[PATCH v2] kdb: Refactor env variables get/set code
Date
Add two new kdb environment access methods as kdb_setenv() and
kdb_printenv() in order to abstract out environment access code
from kdb command functions.

Also, replace (char *)0 with NULL as an initializer for environment
variables array.

Signed-off-by: Sumit Garg <sumit.garg@linaro.org>
---

Changes in v2:
- Get rid of code motion to separate kdb_env.c file.
- Replace (char *)0 with NULL.
- Use kernel-doc style function comments.
- s/kdb_prienv/kdb_printenv/

kernel/debug/kdb/kdb_main.c | 166 +++++++++++++++++++++++++-------------------
1 file changed, 93 insertions(+), 73 deletions(-)

diff --git a/kernel/debug/kdb/kdb_main.c b/kernel/debug/kdb/kdb_main.c
index 588062a..b257d35 100644
--- a/kernel/debug/kdb/kdb_main.c
+++ b/kernel/debug/kdb/kdb_main.c
@@ -142,40 +142,40 @@ static const int __nkdb_err = ARRAY_SIZE(kdbmsgs);

static char *__env[] = {
#if defined(CONFIG_SMP)
- "PROMPT=[%d]kdb> ",
+ "PROMPT=[%d]kdb> ",
#else
- "PROMPT=kdb> ",
+ "PROMPT=kdb> ",
#endif
- "MOREPROMPT=more> ",
- "RADIX=16",
- "MDCOUNT=8", /* lines of md output */
- KDB_PLATFORM_ENV,
- "DTABCOUNT=30",
- "NOSECT=1",
- (char *)0,
- (char *)0,
- (char *)0,
- (char *)0,
- (char *)0,
- (char *)0,
- (char *)0,
- (char *)0,
- (char *)0,
- (char *)0,
- (char *)0,
- (char *)0,
- (char *)0,
- (char *)0,
- (char *)0,
- (char *)0,
- (char *)0,
- (char *)0,
- (char *)0,
- (char *)0,
- (char *)0,
- (char *)0,
- (char *)0,
- (char *)0,
+ "MOREPROMPT=more> ",
+ "RADIX=16",
+ "MDCOUNT=8", /* lines of md output */
+ KDB_PLATFORM_ENV,
+ "DTABCOUNT=30",
+ "NOSECT=1",
+ NULL,
+ NULL,
+ NULL,
+ NULL,
+ NULL,
+ NULL,
+ NULL,
+ NULL,
+ NULL,
+ NULL,
+ NULL,
+ NULL,
+ NULL,
+ NULL,
+ NULL,
+ NULL,
+ NULL,
+ NULL,
+ NULL,
+ NULL,
+ NULL,
+ NULL,
+ NULL,
+ NULL,
};

static const int __nenv = ARRAY_SIZE(__env);
@@ -318,6 +318,65 @@ int kdbgetintenv(const char *match, int *value)
}

/*
+ * kdb_setenv() - Alter an existing environment variable or create a new one.
+ * @var: Name of the variable
+ * @val: Value of the variable
+ *
+ * Return: Zero on success, a kdb diagnostic on failure.
+ */
+static int kdb_setenv(const char *var, const char *val)
+{
+ int i;
+ char *ep;
+ size_t varlen, vallen;
+
+ varlen = strlen(var);
+ vallen = strlen(val);
+ ep = kdballocenv(varlen + vallen + 2);
+ if (ep == (char *)0)
+ return KDB_ENVBUFFULL;
+
+ sprintf(ep, "%s=%s", var, val);
+
+ ep[varlen+vallen+1] = '\0';
+
+ for (i = 0; i < __nenv; i++) {
+ if (__env[i]
+ && ((strncmp(__env[i], var, varlen) == 0)
+ && ((__env[i][varlen] == '\0')
+ || (__env[i][varlen] == '=')))) {
+ __env[i] = ep;
+ return 0;
+ }
+ }
+
+ /*
+ * Wasn't existing variable. Fit into slot.
+ */
+ for (i = 0; i < __nenv-1; i++) {
+ if (__env[i] == (char *)0) {
+ __env[i] = ep;
+ return 0;
+ }
+ }
+
+ return KDB_ENVFULL;
+}
+
+/*
+ * kdb_printenv() - Display the current environment variables.
+ */
+static void kdb_printenv(void)
+{
+ int i;
+
+ for (i = 0; i < __nenv; i++) {
+ if (__env[i])
+ kdb_printf("%s\n", __env[i]);
+ }
+}
+
+/*
* kdbgetularg - This function will convert a numeric string into an
* unsigned long value.
* Parameters:
@@ -374,10 +433,6 @@ int kdbgetu64arg(const char *arg, u64 *value)
*/
int kdb_set(int argc, const char **argv)
{
- int i;
- char *ep;
- size_t varlen, vallen;
-
/*
* we can be invoked two ways:
* set var=value argv[1]="var", argv[2]="value"
@@ -422,37 +477,7 @@ int kdb_set(int argc, const char **argv)
* Tokenizer squashed the '=' sign. argv[1] is variable
* name, argv[2] = value.
*/
- varlen = strlen(argv[1]);
- vallen = strlen(argv[2]);
- ep = kdballocenv(varlen + vallen + 2);
- if (ep == (char *)0)
- return KDB_ENVBUFFULL;
-
- sprintf(ep, "%s=%s", argv[1], argv[2]);
-
- ep[varlen+vallen+1] = '\0';
-
- for (i = 0; i < __nenv; i++) {
- if (__env[i]
- && ((strncmp(__env[i], argv[1], varlen) == 0)
- && ((__env[i][varlen] == '\0')
- || (__env[i][varlen] == '=')))) {
- __env[i] = ep;
- return 0;
- }
- }
-
- /*
- * Wasn't existing variable. Fit into slot.
- */
- for (i = 0; i < __nenv-1; i++) {
- if (__env[i] == (char *)0) {
- __env[i] = ep;
- return 0;
- }
- }
-
- return KDB_ENVFULL;
+ return kdb_setenv(argv[1], argv[2]);
}

static int kdb_check_regs(void)
@@ -2055,12 +2080,7 @@ static int kdb_lsmod(int argc, const char **argv)

static int kdb_env(int argc, const char **argv)
{
- int i;
-
- for (i = 0; i < __nenv; i++) {
- if (__env[i])
- kdb_printf("%s\n", __env[i]);
- }
+ kdb_printenv();

if (KDB_DEBUG(MASK))
kdb_printf("KDBDEBUG=0x%x\n",
--
2.7.4
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