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src/legacy/getusershell.c

 

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#define _GNU_SOURCE

 

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#include <stdio.h>

 

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#include <string.h>

 

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#include <stdlib.h>

 

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static const char defshells[] = "/bin/sh\n/bin/csh\n";

 

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static char *line;

 

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static size_t linesize;

 

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static FILE *f;

 

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void endusershell(void)

 

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{

 

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        if (f) fclose(f);

 

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        f = 0;

 

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}

 

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void setusershell(void)

 

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{

 

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        if (!f) f = fopen("/etc/shells", "rbe");

 

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        if (!f) f = fmemopen((void *)defshells, sizeof defshells - 1, "rb");

 

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}

 

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char *getusershell(void)

 

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{

 

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        ssize_t l;

 

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        if (!f) setusershell();

 

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        if (!f) return 0;

 

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        l = getline(&line, &linesize, f);

 

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        if (l <= 0) return 0;

 

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        if (line[l-1]=='\n') line[l-1]=0;

 

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        return line;

 

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}

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