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34 lines
619 B
34 lines
619 B
#define _GNU_SOURCE
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#include <stdio.h>
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#include <unistd.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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do {
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l = getline(&line, &linesize, f);
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if (l <= 0) return 0;
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} while (line[0] == '#' || line[0] == '\n');
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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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