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usr/kinit/getintfile.c

 

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/*

 

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 * getintfile.c

 

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 *

 

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 * Open a file and read it, assuming it contains a single long value.

 

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 * Return 0 if we read a valid value, otherwise -1.

 

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 */

 

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#include <stdio.h>

 

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#include <stdlib.h>

 

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int getintfile(const char *path, long *val)

 

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{

 

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        char buffer[64];

 

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        char *ep;

 

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        FILE *f;

 

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        f = fopen(path, "r");

 

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        if ( !f )

 

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                return -1;

 

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        ep = buffer + fread(buffer, 1, sizeof buffer-1, f);

 

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        fclose(f);

 

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        *ep = '\0';

 

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        *val = strtol(buffer, &ep, 0);

 

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        if ( *ep && *ep != '\n' )

 

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                return -1;

 

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        else

 

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                return 0;

 

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}

 

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