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From 003b58782b12798da3da8b952152988a88dfb532 Mon Sep 17 00:00:00 2001
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From: Pierce Lopez <pierce.lopez@gmail.com>
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Date: Sun, 10 May 2020 13:20:02 -0400
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Subject: [PATCH] fix json_parse_uint64() usage of errno
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introduced in #542
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fixes #601
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---
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json_util.c | 8 +++-----
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json_util.h | 1 +
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tests/test_parse_int64.expected | 8 ++++----
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3 files changed, 8 insertions(+), 9 deletions(-)
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diff --git a/json_util.c b/json_util.c
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index d3ee47df72..e8e2ec6bcb 100644
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--- a/json_util.c
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+++ b/json_util.c
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@@ -245,19 +245,17 @@ int json_parse_uint64(const char *buf, uint64_t *retval)
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{
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char *end = NULL;
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uint64_t val;
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- errno = 1;
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+ errno = 0;
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while (*buf == ' ')
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- {
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buf++;
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- }
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if (*buf == '-')
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- errno = 0;
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+ return 1; /* error: uint cannot be negative */
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val = strtoull(buf, &end, 10);
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if (end != buf)
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*retval = val;
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- return ((errno == 0) || (end == buf)) ? 1 : 0;
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+ return ((val == 0 && errno != 0) || (end == buf)) ? 1 : 0;
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}
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#ifndef HAVE_REALLOC
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diff --git a/json_util.h b/json_util.h
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index 2a4b6c19bd..7520f036c4 100644
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--- a/json_util.h
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+++ b/json_util.h
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@@ -100,6 +100,7 @@ JSON_EXPORT int json_object_to_fd(int fd, struct json_object *obj, int flags);
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*/
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JSON_EXPORT const char *json_util_get_last_err(void);
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+/* these parsing helpers return zero on success */
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JSON_EXPORT int json_parse_int64(const char *buf, int64_t *retval);
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JSON_EXPORT int json_parse_uint64(const char *buf, uint64_t *retval);
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JSON_EXPORT int json_parse_double(const char *buf, double *retval);
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diff --git a/tests/test_parse_int64.expected b/tests/test_parse_int64.expected
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index f4c5750b0b..6dca94b470 100644
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--- a/tests/test_parse_int64.expected
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+++ b/tests/test_parse_int64.expected
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@@ -34,13 +34,13 @@ buf=123 parseit=0, value=123
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==========json_parse_uint64() test===========
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buf=x parseit=1, value=666
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buf=0 parseit=0, value=0
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-buf=-0 parseit=1, value=0
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+buf=-0 parseit=1, value=666
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buf=00000000 parseit=0, value=0
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-buf=-00000000 parseit=1, value=0
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+buf=-00000000 parseit=1, value=666
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buf=1 parseit=0, value=1
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buf=2147483647 parseit=0, value=2147483647
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-buf=-1 parseit=1, value=18446744073709551615
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-buf=-9223372036854775808 parseit=1, value=9223372036854775808
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+buf=-1 parseit=1, value=666
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+buf=-9223372036854775808 parseit=1, value=666
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buf= 1 parseit=0, value=1
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buf=00001234 parseit=0, value=1234
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buf=0001234x parseit=0, value=1234
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