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![Jim Meyering](/assets/img/avatar_default.png)
This change removes all obvious useless if-before-free tests. E.g., it replaces code like this: if (some_expression) free (some_expression); with the now-equivalent: free (some_expression); It is equivalent not just because POSIX has required free(NULL) to work for a long time, but simply because it has worked for so long that no reasonable porting target fails the test. Here's some evidence from nearly 1.5 years ago: http://www.winehq.org/pipermail/wine-patches/2006-October/031544.html FYI, the change below was prepared by running the following: git ls-files -z | xargs -0 \ perl -0x3b -pi -e \ 's/\bif\s*\(\s*(\S+?)(?:\s*!=\s*NULL)?\s*\)\s+(free\s*\(\s*\1\s*\))/$2/s' Note however, that it doesn't handle brace-enclosed blocks like "if (x) { free (x); }". But that's ok, since there were none like that in git sources. Beware: if you do use the above snippet, note that it can produce syntactically invalid C code. That happens when the affected "if"-statement has a matching "else". E.g., it would transform this if (x) free (x); else foo (); into this: free (x); else foo (); There were none of those here, either. If you're interested in automating detection of the useless tests, you might like the useless-if-before-free script in gnulib: [it *does* detect brace-enclosed free statements, and has a --name=S option to make it detect free-like functions with different names] http://git.sv.gnu.org/gitweb/?p=gnulib.git;a=blob;f=build-aux/useless-if-before-free Addendum: Remove one more (in imap-send.c), spotted by Jean-Luc Herren <jlh@gmx.ch>. Signed-off-by: Jim Meyering <meyering@redhat.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
104 lines
2.1 KiB
C
104 lines
2.1 KiB
C
/*
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* Copyright 2006 Jon Loeliger
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*/
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#include "git-compat-util.h"
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#include "interpolate.h"
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void interp_set_entry(struct interp *table, int slot, const char *value)
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{
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char *oldval = table[slot].value;
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char *newval = NULL;
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free(oldval);
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if (value)
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newval = xstrdup(value);
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table[slot].value = newval;
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}
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void interp_clear_table(struct interp *table, int ninterps)
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{
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int i;
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for (i = 0; i < ninterps; i++) {
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interp_set_entry(table, i, NULL);
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}
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}
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/*
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* Convert a NUL-terminated string in buffer orig
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* into the supplied buffer, result, whose length is reslen,
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* performing substitutions on %-named sub-strings from
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* the table, interps, with ninterps entries.
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*
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* Example interps:
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* {
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* { "%H", "example.org"},
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* { "%port", "123"},
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* { "%%", "%"},
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* }
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*
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* Returns the length of the substituted string (not including the final \0).
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* Like with snprintf, if the result is >= reslen, then it overflowed.
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*/
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unsigned long interpolate(char *result, unsigned long reslen,
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const char *orig,
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const struct interp *interps, int ninterps)
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{
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const char *src = orig;
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char *dest = result;
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unsigned long newlen = 0;
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const char *name, *value;
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unsigned long namelen, valuelen;
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int i;
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char c;
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while ((c = *src)) {
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if (c == '%') {
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/* Try to match an interpolation string. */
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for (i = 0; i < ninterps; i++) {
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name = interps[i].name;
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namelen = strlen(name);
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if (strncmp(src, name, namelen) == 0)
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break;
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}
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/* Check for valid interpolation. */
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if (i < ninterps) {
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value = interps[i].value;
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if (!value) {
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src += namelen;
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continue;
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}
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valuelen = strlen(value);
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if (newlen + valuelen < reslen) {
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/* Substitute. */
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memcpy(dest, value, valuelen);
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dest += valuelen;
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}
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newlen += valuelen;
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src += namelen;
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continue;
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}
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}
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/* Straight copy one non-interpolation character. */
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if (newlen + 1 < reslen)
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*dest++ = *src;
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src++;
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newlen++;
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}
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/* XXX: the previous loop always keep room for the ending NUL,
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we just need to check if there was room for a NUL in the first place */
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if (reslen > 0)
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*dest = '\0';
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return newlen;
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}
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