107 lines
1.4 KiB
C
107 lines
1.4 KiB
C
/* pwd.c */
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#include <unistd.h>
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extern int optind;
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#include <stdlib.h>
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#include <stdio.h>
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/* types */
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typedef enum _pwd_flag {
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PWD_P = 1,
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PWD_LP = 2
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} pwd_flag;
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/* pwd */
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static int _pwd(pwd_flag pf)
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{
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char * pwd;
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char buf[256];
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char * p;
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pwd = getenv("PWD");
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if(pf == PWD_LP && pwd != NULL && *pwd == '/')
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{
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for(p = pwd; *p != '\0'; p++)
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{
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if(*p != '/')
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continue;
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if(*++p != '.')
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continue;
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if(*++p == '\0' || *p == '/')
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{
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p--;
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break;
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}
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if(*p != '.')
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continue;
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if(*++p == '\0' || *p == '/')
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{
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p--;
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break;
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}
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}
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if(*p == '\0')
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{
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printf("%s\n", pwd);
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return 0;
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}
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}
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if(pwd != NULL)
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{
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/* FIXME check for symlinks */
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}
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else
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{
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if(getcwd(buf, 255) == NULL)
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{
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fprintf(stderr, "%s", "pwd: ");
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perror("getcwd");
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return 2;
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}
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buf[255] = '\0';
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pwd = buf;
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}
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printf("%s\n", pwd);
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return 0;
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}
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/* usage */
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static int _usage(void)
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{
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fprintf(stderr, "Usage: pwd [-L|-P]\n\
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-L avoid \".\" or \"..\" filenames\n\
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-P avoid symbolic links\n");
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return 1;
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}
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/* main */
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int main(int argc, char * argv[])
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{
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pwd_flag pf = PWD_LP;
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int o;
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while((o = getopt(argc, argv, "LP")) != -1)
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{
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switch(o)
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{
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case 'L':
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pf = PWD_LP;
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break;
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case 'P':
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pf = PWD_P;
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break;
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case '?':
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return _usage();
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}
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}
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if(optind != argc)
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return _usage();
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return _pwd(pf);
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}
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