Last change
on this file since 388 was 388, checked in by coas-nagasima, 5 years ago |
Azure IoT Hub Device C SDK を使ったサンプルの追加
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Property svn:eol-style
set to
native
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Property svn:keywords
set to
Id
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Property svn:mime-type
set to
text/x-csrc
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File size:
973 bytes
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Rev | Line | |
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[388] | 1 | #define _GNU_SOURCE
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| 2 | #include <ctype.h>
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| 3 | #include <string.h>
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| 4 |
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| 5 | int strverscmp(const char *l0, const char *r0)
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| 6 | {
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| 7 | const unsigned char *l = (const void *)l0;
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| 8 | const unsigned char *r = (const void *)r0;
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| 9 | size_t i, dp, j;
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| 10 | int z = 1;
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| 11 |
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| 12 | /* Find maximal matching prefix and track its maximal digit
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| 13 | * suffix and whether those digits are all zeros. */
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| 14 | for (dp=i=0; l[i]==r[i]; i++) {
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| 15 | int c = l[i];
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| 16 | if (!c) return 0;
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| 17 | if (!isdigit(c)) dp=i+1, z=1;
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| 18 | else if (c!='0') z=0;
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| 19 | }
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| 20 |
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| 21 | if (l[dp]!='0' && r[dp]!='0') {
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| 22 | /* If we're not looking at a digit sequence that began
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| 23 | * with a zero, longest digit string is greater. */
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| 24 | for (j=i; isdigit(l[j]); j++)
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| 25 | if (!isdigit(r[j])) return 1;
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| 26 | if (isdigit(r[j])) return -1;
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| 27 | } else if (z && dp<i && (isdigit(l[i]) || isdigit(r[i]))) {
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| 28 | /* Otherwise, if common prefix of digit sequence is
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| 29 | * all zeros, digits order less than non-digits. */
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| 30 | return (unsigned char)(l[i]-'0') - (unsigned char)(r[i]-'0');
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| 31 | }
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| 32 |
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| 33 | return l[i] - r[i];
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| 34 | }
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