forked from KolibriOS/kolibrios
51 lines
1.6 KiB
C
51 lines
1.6 KiB
C
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#include <string.h>
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#include <stdlib.h>
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char *dirname (char *path)
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{
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static const char dot[] = ".";
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char *last_slash;
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/* Find last '/'. */
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last_slash = path != NULL ? strrchr (path, '/') : NULL;
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if (last_slash != NULL && last_slash != path && last_slash[1] == '\0')
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{
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/* Determine whether all remaining characters are slashes. */
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char *runp;
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for (runp = last_slash; runp != path; --runp)
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if (runp[-1] != '/')
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break;
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/* The '/' is the last character, we have to look further. */
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if (runp != path)
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last_slash = memrchr (path, '/', runp - path);
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}
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if (last_slash != NULL)
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{
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/* Determine whether all remaining characters are slashes. */
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char *runp;
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for (runp = last_slash; runp != path; --runp)
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if (runp[-1] != '/')
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break;
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/* Terminate the path. */
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if (runp == path)
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{
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/* The last slash is the first character in the string. We have to
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return "/". As a special case we have to return "//" if there
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are exactly two slashes at the beginning of the string. See
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XBD 4.10 Path Name Resolution for more information. */
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if (last_slash == path + 1)
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++last_slash;
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else
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last_slash = path + 1;
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}
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else
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last_slash = runp;
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last_slash[0] = '\0';
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}
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else
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/* This assignment is ill-designed but the XPG specs require to
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return a string containing "." in any case no directory part is
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found and so a static and constant string is required. */
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path = (char *) dot;
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return path;
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}
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