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json: optimize number parsing for large number datasets - json2tsv - JSON to TS… |
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git clone git://git.codemadness.org/json2tsv |
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--- |
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commit 226d85203f7ea26dcc71c98e0fb7fe3ffb78176b |
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parent 650481927d19d28d035d470bdedd2e2226e4dbd2 |
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Author: Hiltjo Posthuma <[email protected]> |
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Date: Thu, 23 Sep 2021 18:31:00 +0200 |
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json: optimize number parsing for large number datasets |
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Measured on OpenBSD and Voidlinux glibc (gcc and clang). |
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Not much difference on AMD Ryzen with GNUVoid Linux (glibc). |
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Tested and much difference on OpenBSD-current (laptop, older Intel CPU), 6.8 |
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and 6.9 (older Intel Xeons). |
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Tested with json-testsuite, no differences (as intended). |
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Diffstat: |
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M json.c | 3 ++- |
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1 file changed, 2 insertions(+), 1 deletion(-) |
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--- |
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diff --git a/json.c b/json.c |
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@@ -291,7 +291,8 @@ escchr: |
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while (1) { |
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c = GETNEXT(); |
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if (c == EOF || |
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- !c || !strchr("0123456789eE+-.", c) || |
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+ (!isdigit(c) && c != 'e' && c != 'E' && |
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+ c != '+' && c != '-' && c != '.') || |
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p + 1 >= sizeof(pri)) { |
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pri[p] = '\0'; |
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cb(nodes, depth + 1, pri); |
