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escape: zero length input should return a zero length output

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Regression added in 7.71.0.

Fixes #5601
Reported-by: Kristoffer Gleditsch
Closes #5602
This commit is contained in:
Daniel Stenberg 2020-06-24 15:23:19 +02:00
parent d2baa502fc
commit 32defc3197
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1 changed files with 3 additions and 0 deletions
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3
lib/escape.c
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@ -89,6 +89,9 @@ char *curl_easy_escape(struct Curl_easy *data, const char *string,
Curl_dyn_init(&d, CURL_MAX_INPUT_LENGTH);
length = (inlength?(size_t)inlength:strlen(string));
if(!length)
return strdup("");
while(length--) {
unsigned char in = *string; /* we need to treat the characters unsigned */