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b992657ed0
The usual pattern for an argv array is to initialize it, push in some strings, and then clear it when done. Very occasionally, though, we must do other exotic things with the memory, like freeing the list but keeping the strings. Let's provide a detach function so that callers can make use of our API to build up the array, and then take ownership of it. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
88 lines
1.7 KiB
C
88 lines
1.7 KiB
C
#include "cache.h"
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#include "argv-array.h"
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#include "strbuf.h"
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const char *empty_argv[] = { NULL };
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void argv_array_init(struct argv_array *array)
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{
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array->argv = empty_argv;
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array->argc = 0;
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array->alloc = 0;
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}
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static void argv_array_push_nodup(struct argv_array *array, const char *value)
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{
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if (array->argv == empty_argv)
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array->argv = NULL;
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ALLOC_GROW(array->argv, array->argc + 2, array->alloc);
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array->argv[array->argc++] = value;
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array->argv[array->argc] = NULL;
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}
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void argv_array_push(struct argv_array *array, const char *value)
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{
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argv_array_push_nodup(array, xstrdup(value));
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}
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void argv_array_pushf(struct argv_array *array, const char *fmt, ...)
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{
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va_list ap;
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struct strbuf v = STRBUF_INIT;
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va_start(ap, fmt);
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strbuf_vaddf(&v, fmt, ap);
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va_end(ap);
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argv_array_push_nodup(array, strbuf_detach(&v, NULL));
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}
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void argv_array_pushl(struct argv_array *array, ...)
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{
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va_list ap;
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const char *arg;
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va_start(ap, array);
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while((arg = va_arg(ap, const char *)))
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argv_array_push(array, arg);
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va_end(ap);
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}
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void argv_array_pushv(struct argv_array *array, const char **argv)
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{
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for (; *argv; argv++)
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argv_array_push(array, *argv);
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}
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void argv_array_pop(struct argv_array *array)
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{
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if (!array->argc)
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return;
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free((char *)array->argv[array->argc - 1]);
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array->argv[array->argc - 1] = NULL;
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array->argc--;
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}
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void argv_array_clear(struct argv_array *array)
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{
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if (array->argv != empty_argv) {
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int i;
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for (i = 0; i < array->argc; i++)
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free((char *)array->argv[i]);
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free(array->argv);
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}
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argv_array_init(array);
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}
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const char **argv_array_detach(struct argv_array *array)
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{
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if (array->argv == empty_argv)
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return xcalloc(1, sizeof(const char *));
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else {
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const char **ret = array->argv;
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argv_array_init(array);
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return ret;
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}
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}
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