1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Utility routines.
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4 | *
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5 | * Copyright (C) 2005, 2006 Rob Landley <rob@landley.net>
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6 | * Copyright (C) 2004 Erik Andersen <andersen@codepoet.org>
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7 | * Copyright (C) 2001 Matt Krai
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8 | *
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9 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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10 | */
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11 |
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12 | #include "libbb.h"
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13 |
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14 | /* This function reads an entire line from a text file, up to a newline
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15 | * or NUL byte, inclusive. It returns a malloc'ed char * which must be
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16 | * stored and free'ed by the caller. If end is NULL '\n' isn't considered
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17 | * end of line. If end isn't NULL, length of the chunk read is stored in it.
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18 | * Return NULL if EOF/error */
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19 |
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20 | char *bb_get_chunk_from_file(FILE *file, int *end)
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21 | {
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22 | int ch;
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23 | int idx = 0;
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24 | char *linebuf = NULL;
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25 | int linebufsz = 0;
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26 |
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27 | while ((ch = getc(file)) != EOF) {
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28 | /* grow the line buffer as necessary */
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29 | if (idx >= linebufsz) {
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30 | linebufsz += 80;
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31 | linebuf = xrealloc(linebuf, linebufsz);
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32 | }
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33 | linebuf[idx++] = (char) ch;
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34 | if (!ch || (end && ch == '\n'))
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35 | break;
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36 | }
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37 | if (end)
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38 | *end = idx;
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39 | if (linebuf) {
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40 | // huh, does fgets discard prior data on error like this?
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41 | // I don't think so....
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42 | //if (ferror(file)) {
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43 | // free(linebuf);
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44 | // return NULL;
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45 | //}
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46 | linebuf = xrealloc(linebuf, idx+1);
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47 | linebuf[idx] = '\0';
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48 | }
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49 | return linebuf;
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50 | }
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51 |
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52 | /* Get line, including trailing \n if any */
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53 | char *xmalloc_fgets(FILE *file)
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54 | {
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55 | int i;
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56 |
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57 | return bb_get_chunk_from_file(file, &i);
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58 | }
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59 |
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60 | /* Get line. Remove trailing \n */
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61 | char *xmalloc_getline(FILE *file)
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62 | {
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63 | int i;
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64 | char *c = bb_get_chunk_from_file(file, &i);
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65 |
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66 | if (i && c[--i] == '\n')
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67 | c[i] = '\0';
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68 |
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69 | return c;
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70 | }
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