96 lines
2.3 KiB
C
96 lines
2.3 KiB
C
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/* dirname - return directory portion of pathname */
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/* See Makefile for compilation details. */
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#include "config.h"
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#if defined (HAVE_UNISTD_H)
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# include <unistd.h>
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#endif
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#include <stdio.h>
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#include "builtins.h"
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#include "shell.h"
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dirname_builtin (list)
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WORD_LIST *list;
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{
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int slen;
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char *string;
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if (list == 0 || list->next)
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{
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builtin_usage ();
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return (EX_USAGE);
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}
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if (no_options (list))
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return (EX_USAGE);
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string = list->word->word;
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slen = strlen (string);
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/* Strip trailing slashes */
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while (slen > 0 && string[slen - 1] == '/')
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slen--;
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/* (2) If string consists entirely of slash characters, string shall be
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set to a single slash character. In this case, skip steps (3)
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through (8). */
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if (slen == 0)
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{
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fputs ("/\n", stdout);
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return (EXECUTION_SUCCESS);
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}
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/* (3) If there are any trailing slash characters in string, they
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shall be removed. */
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string[slen] = '\0';
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/* (4) If there are no slash characters remaining in string, string
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shall be set to a single period character. In this case, skip
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steps (5) through (8).
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(5) If there are any trailing nonslash characters in string,
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they shall be removed. */
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while (--slen >= 0)
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if (string[slen] == '/')
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break;
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if (slen >= 0)
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{
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fputs (".\n", stdout);
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return (EXECUTION_SUCCESS);
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}
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/* (7) If there are any trailing slash characters in string, they
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shall be removed. */
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while (--slen >= 0)
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if (string[slen] != '/')
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break;
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string[++slen] = '\0';
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/* (8) If the remaining string is empty, string shall be set to a single
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slash character. */
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printf ("%s\n", (slen == 0) ? "/" : string);
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return (EXECUTION_SUCCESS);
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}
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char *dirname_doc[] = {
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"The STRING is converted to the name of the directory containing",
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"the filename corresponding to the last pathname component in STRING.",
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(char *)NULL
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};
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/* The standard structure describing a builtin command. bash keeps an array
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of these structures. */
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struct builtin dirname_struct = {
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"dirname", /* builtin name */
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dirname_builtin, /* function implementing the builtin */
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BUILTIN_ENABLED, /* initial flags for builtin */
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dirname_doc, /* array of long documentation strings. */
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"dirname string", /* usage synopsis */
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0 /* reserved for internal use */
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};
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