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Date: Sat, 2 May 2015 03:53:24 +0300
From: Alexey Dobriyan <adobriyan@...il.com>
To: akpm@...ux-foundation.org
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH 05/10] parse_integer: convert lib/
Convert away lib/ from deprecated simple_strto*() interfaces.
"&(int []){0}[0]" expression is anonymous variable, don't be scared.
Filesystem option parser code does parsing 1.5 times: first to know
boundaries of a value (args[0].from, args[0].to) and then actual
parsing with match_number(). Noody knows why it does that.
match_number() needlessly allocates/duplicates memory,
parsing can be done straight from original string.
Signed-off-by: Alexey Dobriyan <adobriyan@...il.com>
---
lib/cmdline.c | 36 ++++++++++++++++++------------------
lib/parser.c | 29 ++++++++++++-----------------
lib/swiotlb.c | 2 +-
3 files changed, 31 insertions(+), 36 deletions(-)
--- a/lib/cmdline.c
+++ b/lib/cmdline.c
@@ -27,7 +27,7 @@ static int get_range(char **str, int *pint)
int x, inc_counter, upper_range;
(*str)++;
- upper_range = simple_strtol((*str), NULL, 0);
+ parse_integer(*str, 0, &upper_range);
inc_counter = upper_range - *pint;
for (x = *pint; x < upper_range; x++)
*pint++ = x;
@@ -51,13 +51,14 @@ static int get_range(char **str, int *pint)
int get_option(char **str, int *pint)
{
- char *cur = *str;
+ int len;
- if (!cur || !(*cur))
+ if (!str || !*str)
return 0;
- *pint = simple_strtol(cur, str, 0);
- if (cur == *str)
+ len = parse_integer(*str, 0, pint);
+ if (len < 0)
return 0;
+ *str += len;
if (**str == ',') {
(*str)++;
return 2;
@@ -126,38 +127,37 @@ EXPORT_SYMBOL(get_options);
unsigned long long memparse(const char *ptr, char **retptr)
{
- char *endptr; /* local pointer to end of parsed string */
+ unsigned long long val;
- unsigned long long ret = simple_strtoull(ptr, &endptr, 0);
-
- switch (*endptr) {
+ ptr += parse_integer(ptr, 0, &val);
+ switch (*ptr) {
case 'E':
case 'e':
- ret <<= 10;
+ val <<= 10;
case 'P':
case 'p':
- ret <<= 10;
+ val <<= 10;
case 'T':
case 't':
- ret <<= 10;
+ val <<= 10;
case 'G':
case 'g':
- ret <<= 10;
+ val <<= 10;
case 'M':
case 'm':
- ret <<= 10;
+ val <<= 10;
case 'K':
case 'k':
- ret <<= 10;
- endptr++;
+ val <<= 10;
+ ptr++;
default:
break;
}
if (retptr)
- *retptr = endptr;
+ *retptr = (char *)ptr;
- return ret;
+ return val;
}
EXPORT_SYMBOL(memparse);
--- a/lib/parser.c
+++ b/lib/parser.c
@@ -44,7 +44,7 @@ static int match_one(char *s, const char *p, substring_t args[])
p = meta + 1;
if (isdigit(*p))
- len = simple_strtoul(p, (char **) &p, 10);
+ p += parse_integer(p, 10, (unsigned int *)&len);
else if (*p == '%') {
if (*s++ != '%')
return 0;
@@ -68,19 +68,21 @@ static int match_one(char *s, const char *p, substring_t args[])
break;
}
case 'd':
- simple_strtol(s, &args[argc].to, 0);
+ /* anonymous variable */
+ len = parse_integer(s, 0, &(int []){0}[0]);
goto num;
case 'u':
- simple_strtoul(s, &args[argc].to, 0);
+ len = parse_integer(s, 0, &(unsigned int []){0}[0]);
goto num;
case 'o':
- simple_strtoul(s, &args[argc].to, 8);
+ len = parse_integer(s, 8, &(unsigned int []){0}[0]);
goto num;
case 'x':
- simple_strtoul(s, &args[argc].to, 16);
+ len = parse_integer(s, 16, &(unsigned int []){0}[0]);
num:
- if (args[argc].to == args[argc].from)
+ if (len < 0)
return 0;
+ args[argc].to = args[argc].from + len;
break;
default:
return 0;
@@ -127,10 +129,8 @@ EXPORT_SYMBOL(match_token);
*/
static int match_number(substring_t *s, int *result, int base)
{
- char *endp;
char *buf;
int ret;
- long val;
size_t len = s->to - s->from;
buf = kmalloc(len + 1, GFP_KERNEL);
@@ -139,16 +139,11 @@ static int match_number(substring_t *s, int *result, int base)
memcpy(buf, s->from, len);
buf[len] = '\0';
- ret = 0;
- val = simple_strtol(buf, &endp, base);
- if (endp == buf)
- ret = -EINVAL;
- else if (val < (long)INT_MIN || val > (long)INT_MAX)
- ret = -ERANGE;
- else
- *result = (int) val;
+ ret = parse_integer(buf, base, result);
kfree(buf);
- return ret;
+ if (ret < 0)
+ return ret;
+ return 0;
}
/**
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -100,7 +100,7 @@ static int __init
setup_io_tlb_npages(char *str)
{
if (isdigit(*str)) {
- io_tlb_nslabs = simple_strtoul(str, &str, 0);
+ str += parse_integer(str, 0, &io_tlb_nslabs);
/* avoid tail segment of size < IO_TLB_SEGSIZE */
io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE);
}
--
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